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Medicine Science

Degenerative Brain Disease Found In Nearly All Donated NFL Player Brains, Says Study (npr.org) 213

A new study published Tuesday in the journal American Medical Association found that 110 out of 111 brains of those who played in the NFL had degenerative brain disease chronic traumatic encephalopathy (CTE). NPR reports: In the study, researchers examined the brains of 202 deceased former football players at all levels. Nearly 88 percent of all the brains, 177, had CTE. Three of 14 who had played only in high school had CTE, 48 of 53 college players, 9 of 14 semiprofessional players, and 7 of 8 Canadian Football League players. CTE was not found in the brains of two who played football before high school. According to the study's senior author, Dr. Ann McKee, "this is by far the largest [study] of individuals who developed CTE that has ever been described. And it only includes individuals who are exposed to head trauma by participation in football." A CTE study several years ago by McKee and her colleagues included football players and athletes from other collision sports such as hockey, soccer and rugby. It also examined the brains of military veterans who had suffered head injuries. The study released Tuesday is the continuation of a study that began eight years ago. In 2015, McKee and fellow researchers at the Department of Veterans Affairs and Boston University published study results revealing 87 of 91 former NFL players had CTE.
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Degenerative Brain Disease Found In Nearly All Donated NFL Player Brains, Says Study

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  • Sample bias (Score:2, Insightful)

    by Anonymous Coward

    Why would someone donate their brain if they didn't think they had damage?

    • Re:Sample bias (Score:4, Insightful)

      by ShanghaiBill ( 739463 ) on Tuesday July 25, 2017 @09:16PM (#54879307)

      Why would someone donate their brain if they didn't think they had damage?

      Why not? Why do you need to keep your brain if you're dead?

      I am an organ donor, and they are welcome to use any parts they can for anything useful. It may help someone, and it is less that my family has to pay to cremate.

      Disclaimer: I don't play or watch football.

      • by arth1 ( 260657 )

        Why not? Why do you need to keep your brain if you're dead?

        Conversely, why do you need to donate anything when you're dead?
        You won't get a warm fuzzy feeling from it, because you're dead.

        And they don't give a discount on cremation for missing organs.

        • Re: (Score:3, Insightful)

          by Anonymous Coward

          Because it gives you a warm fuzzy feeling whilst you're alive.

          It is satisfying to me to know that when I die, there is a possibility someone else might be able to benefit from that. Rather than it just being an entire waste.

        • You won't get a warm fuzzy feeling from it, because you're dead.

          You get a warm and fuzzy feeling when you sign up. Try it.

          And they don't give a discount on cremation for missing organs.

          Yes they do. Many cremation facilities will vary fees based on the weight of the corpse.

        • Re:Sample bias (Score:5, Insightful)

          by fluffernutter ( 1411889 ) on Tuesday July 25, 2017 @10:47PM (#54879687)
          Oh my lord, I think you just nailed all that is wrong with America in that one statement.
      • by TechyImmigrant ( 175943 ) on Tuesday July 25, 2017 @11:23PM (#54879795) Homepage Journal

        >Why not? Why do you need to keep your brain if you're dead?

        Why do you need a brain if you are an NFL player?

      • by cstacy ( 534252 )

        Why would someone donate their brain if they didn't think they had damage?

        Why not? Why do you need to keep your brain if you're dead?

        Some people also don't need it when they are alive, apparently...

        "I knew it was wrong, I shouldn't have done it...
        I should have never reconnected his Internet."

    • They should analyze Trump's "brain" next.

    • by Anonymous Coward
      Or, perhaps it's just that those with bad brains have a propensity toward football as a career choice. There's a reason for the "dumb jock" stereotype. Which is the cause, which is the effect?
    • Re: Sample bias (Score:5, Informative)

      by JoeRobe ( 207552 ) on Tuesday July 25, 2017 @09:39PM (#54879407) Homepage

      The BBC version of this story actually discusses the sample bias, and the director of the CTE center is quoted fully acknowledging that there's enormous bias.

      http://www.bbc.com/news/world-... [bbc.com]

      • And a separate study came to a significantly different conclusion - that chronic traumatic encephalopathy is a leading cause of organ donation.

      • Re: Sample bias (Score:5, Interesting)

        by interkin3tic ( 1469267 ) on Wednesday July 26, 2017 @12:34AM (#54879971)
        The journal article itself can be found online, open access here. [jamanetwork.com]

        The methods section (emphasis mine)

        Study Recruitment In 2008, as a collaboration among the VA Boston Healthcare System, Bedford VA, Boston University (BU) School of Medicine, and Sports Legacy Institute (now the Concussion Legacy Foundation [CLF]), a brain bank was created to better understand the long-term effects of repetitive head trauma experienced through contact sport participation and military-related exposure. The purpose of the brain bank was to comprehensively examine the neuropathology and clinical presentation of brain donors considered at risk of development of CTE. The institutional review board at Boston University Medical Campus approved all research activities. The next of kin or legally authorized representative of each brain donor provided written informed consent. No stipend for participation was provided. Inclusion criteria were based entirely on exposure to repetitive head trauma (eg, contact sports, military service, or domestic violence), regardless of whether symptoms manifested during life. Playing American football was sufficient for inclusion. Because of limited resources, more strict inclusion criteria were implemented in 2014 and required that football players who died after age 35 years have at least 2 years of college-level play. Donors were excluded if postmortem interval exceeded 72 hours or if fixed tissue fragments representing less than half the total brain volume were received (eFigure in the Supplement).

        It sounds like they selected from donated cadavers for people who had played football. This is quite different from football players who suspected they had brain damage from football donating their brains. There would still be bias, as families who were convinced their loved ones were suffering from brain damage would be more likely to say yes to being in the study. But that's likely NOT NEARLY as big a bias as what GP is suggesting.

        • Re: Sample bias (Score:5, Interesting)

          by tlhIngan ( 30335 ) <slashdot&worf,net> on Wednesday July 26, 2017 @02:05AM (#54880157)

          The problem with CTE is it's cumulative. The more trauma, the more damage. Some of the more aggressive players have unfortunately succumbed with devastating results. Basically, who was once a family man suddenly has behavioral changes which include sudden outbursts of anger and violence that are unprovoked. Who if they weren't football players, we may have normally had jailed or committed.

          Some are even suicidal, which is a shame because most take a bullet to the head, which destroys any evidence. (Some do have enough presence of mind left to avoid damaging the head and thus allowing researchers to diagnose CTE).

          The only reason for doubt is because the NFL is rather self-interested in not promoting tackle football causes CTE. Two reasons. First, they are worried - yes, scared sh*tless - that if the association is made, parents will withdraw their kids from football programs. This may lead to lowered interest in football, which means the millions of dollars it brings in could dry up.

          The second reason is the players associations - they have successfully sued the NFL over hiding or discounting the medical issue which is more than career ending, it's life changing.

          Before CTE was even discovered, it was thought brain damage happened as a result of a major event - it was thought the brain could handle getting hit and recover, when instead it recovers irregularly. CTE is the result of repeated minor brain damage caused by the brain banging against the skull causing scarring and bruising, and which builds up over time.

          The sports associations are heavily into discounting CTE because it really affects their bottom lines. It's also why there's a ton of research going into smart helmets that can indicate when a potentially damaging event occurs, and why at least at the college level and below, the threshold for benching someone has gone from knockout or concussion to a blow that exceeds 75Gs or so, even if the player is still conscious and lucid. And after a concussion, the bench time has a fixed minimum - no longer you wake up and you're in the next game, it's minimum 4-6 weeks benched, and only the doctor can clear you. Heck, some teams have even banned tackling during practice to avoid causing more damage than necessary.

          The link between football (and other contact heavy sports) and CTE has been long proven. There are many well regarded papers behind it. The only question left is what percentage of the football playing population has CTE.

          And finally, this is a VERY recent discovery. Bennet Omalu discovered this in 2002, and the NFL reluctantly acknowledged CTE's existence in 2009, after 7 years of trying to discredit Omalu. It's just like leaded gas, cigarettes, CFCs, and global warming all over again.

          • As I've said before, if the NFL were a drug, it would have been banned years ago.

            • And as with drugs I can only say that if people do it willingly, why outlaw it? It's not like anyone forces them to play there, every single NFL-player has the option to live a normal life with a normal job, it's trivial for them to do just that.

              Why should the government step in and dictate what people can and cannot do with their life? Yes, that may be dangerous or even self destroying, but if someone wants to do that and does not subject anyone to it that didn't himself agree to be part of the whole deal,

        • Re: Sample bias (Score:4, Interesting)

          by JoeRobe ( 207552 ) on Wednesday July 26, 2017 @06:34AM (#54880799) Homepage

          But then there's this quote from the BBC article, which makes it sounds like it was from families who suspected that the deceased had CTE

          "Dr Ann McKee, director of Boston University's CTE Center, which led the study, cautioned against drawing any immediate conclusions.
          "There's a tremendous selection bias," she said, explaining how many of the brains were donated specifically by families who had suspected that their loved ones were suffering from CTE, which researchers believe is caused by repeated blows to the head."

          • Yes, like I said, There would still be bias, as families who were convinced their loved ones were suffering from brain damage would be more likely to say yes to being in the study. But that's likely NOT NEARLY as big a bias as what GP is suggesting.

            Put another way, if researchers approached the family of a deceased individual and asked "can we cut their brain out now, within 72 hours of death, so you'll have to have a closed casket," many people would say no. They'd be more likely to say yes if they tho
    • by sjbe ( 173966 ) on Tuesday July 25, 2017 @10:48PM (#54879689)

      Why would someone donate their brain if they didn't think they had damage?

      Plenty of people donate their brains for research who do not have CTE or other brain damage. This has been studied among the general population quite thoroughly. There is no need for every football player to donate his brain to avoid sample bias. We have a control group in everyone who doesn't play that sport.

    • by sjames ( 1099 )

      Because they believe they're fine and want to defend their beloved sport.

    • by robbak ( 775424 ) on Tuesday July 25, 2017 @11:21PM (#54879789) Homepage
      Quote:

      This study had several limitations. First, a major limitation is ascertainment bias associated with participation in this brain donation program. Although the criteria for participation were based on exposure to repetitive head trauma rather than on clinical signs of brain trauma, public awareness of a possible link between repetitive head trauma and CTE may have motivated players and their families with symptoms and signs of brain injury to participate in this research. Therefore, caution must be used in interpreting the high frequency of CTE in this sample, and estimates of prevalence cannot be concluded or implied from this sample.

    • For research? Plenty of people do that sort of thing. I will leave my body to science even though I don't think they will find anything interesting.

    • While this sample is going to have a much higher ratio of injured brains to non-injured brains than the general NFL population due to selection, the extremely high ratio of 110-to-1 (and 10-1 in a broader population that was studied), makes it unlikely that there are not a lot of former players out there with less severe brain trauma that are not getting flagged as brain damaged.

    • "Even so, the Times notes that, even if the other 1,200 NFL players who’ve died since the project started came up clean, that’d still mean 9 percent of players—a much higher percentage than the general population—developed C.T.E."

    • by Megol ( 3135005 )

      Because they want to further science? That's the main reason that people donate their bodies.

      I assume the paper will mention this and other potential biases as anything other would indicate sloppy research.

    • My fiancè's grandparents have agreed to donate their bodies for scientific research after they die and to the best of my knowledge, neither of them has had and kind of TBE.

      Some people do it because they want to make the world a better place.

      LK

    • by hey! ( 33014 )

      While this is true, 87 of 91 is an astonishingly high proportion.

      Under the "no effect/sampling bias" hypothesis, the brains donated for NFL players would be reflective of the general population of people who suffer from dementia. That would mean that Alzheimer's and vascular dementia would account for the vast majority of cases. The chances of a random sampling of 91 dementia brains turning up 87 cases of traumatic injury is vanishingly small, meaning that it is quite reasonable to conclude that playing f

  • Correlation does not imply causation.
    • Re:Hmmmm (Score:5, Insightful)

      by PsychoSlashDot ( 207849 ) on Tuesday July 25, 2017 @09:14PM (#54879297)

      Correlation does not imply causation.

      Is the implication that playing football causes brain damage, or that having brain damage causes playing football?

      As a lifelong nerd, I've often suspected both are likely, but I suppose you're right that we need to study this more before declaring "I knew it!"

      • Correct.
      • by arth1 ( 260657 )

        Having brain damage might increase the chance of being asked to donate your brain.

        • by Mashiki ( 184564 )

          When you're dead, what do you need your brain for?

          • by arth1 ( 260657 )

            When you're dead, what do you need your brain for?

            That makes as much sense as saying "when you're a sock, what do you need your brain for?"
            The phrase "when you" does not make sense, because there is no you. For a while, there's a carcass, owned by others. The temerity to think you have any right to decide what they do with it is appalling. Your wishes are as valid as a cow's wishes on how to prepare the steaks, i.e. only useful as a humorous device in fiction.

      • Re:Hmmmm (Score:5, Informative)

        by rtb61 ( 674572 ) on Tuesday July 25, 2017 @09:38PM (#54879405) Homepage

        Every single concussion comes with an extent of brain damaged aligned to the severity of the concussion, every single one https://www.brainline.org/arti... [brainline.org]. The more concussions you suffer and the worse they are, the greater your accumulated brain damage. The reason you are concussed is because, yes you brain suffered sufficient impact to cause it harm, that is why you feel concussed. It's like never damaged, bruised nerves, means in those millions of nerve bundles some where broken, severed, ceased to function, resulting in diminished capacity, as for the brain. As different parts of the brain do different things, the direction of the impact has a significant impact on the outcome, some being much more dangerous than others. What probably saves jock straps from more behaviourally visible reduce cerebral function is smaller brains in thicker skulls, with fewer neuron connections and the types of activity they indulge in, not much mental function is required for the activity, in fact reduced mental function is desirable for repetitive training behaviours.

        • Every single concussion comes with an extent of brain damaged aligned to the severity of the concussion, every single one https://www.brainline.org/arti... [brainline.org]. The more concussions you suffer and the worse they are, the greater your accumulated brain damage. The reason you are concussed is because, yes you brain suffered sufficient impact to cause it harm, that is why you feel concussed. It's like never damaged, bruised nerves, means in those millions of nerve bundles some where broken, severed, ceased to function, resulting in diminished capacity, as for the brain. As different parts of the brain do different things, the direction of the impact has a significant impact on the outcome, some being much more dangerous than others. What probably saves jock straps from more behaviourally visible reduce cerebral function is smaller brains in thicker skulls, with fewer neuron connections and the types of activity they indulge in, not much mental function is required for the activity, in fact reduced mental function is desirable for repetitive training behaviours.

          Friend, I have a policy of not shooting for +5 Funny twice in the same discussion, but man... reading your post makes me feel like maybe I've been playing too much football and it's time to donate my brain to science.

        • Ask yourself! (Score:4, Interesting)

          by s.petry ( 762400 ) on Tuesday July 25, 2017 @10:41PM (#54879667)

          If I could be paid millions of dollars a year to exercise for hours every day, travel the country, and play a game a weekend for a few months a year, and I knew the paycheck came with the risk of brain damage, would I? Yeah, probably. Would you? I'm guessing you have would have a price not much different that what NFL players make.

          As long as players are aware of risks, it should be their decision to accept or turn down contracts. I think the problem many have with the current situation is that the NFL and other agencies (allegedly) attempted to hide the risks from players.

          The "allegedly" means that I don't know for fact, and don't care to debate the allegation. If they did, it's wrong but I believe it has been since corrected.

          • Re:Ask yourself! (Score:5, Insightful)

            by fluffernutter ( 1411889 ) on Tuesday July 25, 2017 @10:54PM (#54879707)
            Except the brain damage doesn't start after you sign the contract. It starts just after your dad tells you 'tough kids play football' and you suddenly find yourself on the other side of the scrimmage line from all the freakishly huge kids from the other side of town. Parents are basically volunteering their kids for this in order for their kid to have a change at the big time. That's an awful big risk.
            • by s.petry ( 762400 )
              Risks are, and have been covered, very heavily in all junior level sports for decades. Parents don't need to tell their kids about risk, because everyone involved in the sports organization does. Okay, if you grow up in the bayou without any organized sports parents would be required. Chances are those kids will be eaten by gators or drown noodling before they ever get drafted to college...
            • Here's something that may not have occurred to you. There are people that actually like playing football. Some of them are even intelligent.

      • by johanw ( 1001493 )

        The first statement does not rule out the second. Both can be true.

    • by DumbSwede ( 521261 ) <slashdotbin@hotmail.com> on Tuesday July 25, 2017 @10:01PM (#54879505) Homepage Journal

      Correlation does not PROVE causation. It can however strongly imply causation, especially as we can plainly see and infer the other mechanisms at play here. Let's not be like the cigarette companies here and turn a blind eye to the likely health dangers with misdirection. As for sample bias, when you are 110 for 111 I don't care what your bias is, the likelihood is that far over half of serious football players suffer brain damage of some sort or severity. Football and boxing are not likely to go away in our generation, but they will have to be modified greatly or they will eventually be considered a sport only us ignorant ancients would engage in.

      • by sjbe ( 173966 ) on Tuesday July 25, 2017 @10:41PM (#54879663)

        Correlation does not PROVE causation.

        It's a distinction without a difference in this case. CTE comes from being hit in the head which demonstrably happens a lot in football. CTE is relatively rare among the general population who do not engage in contact sports or who haven't been violently assaulted. It is quite safe to say that playing football is a common cause of CTE. Causation is not really a question in this instance and the causal chain is well understood. Some players manage to avoid being concussed but that doesn't mean that playing football was not the cause in those who do get CTE. There is no other reasonable explanation for their condition aside from head blows received while playing a violent professional sport.

        • Please site where CTE is rare among the general population?

          If I suspect a person has had a concussion, could I then get the brain CTE testing? I think its significant that 1 NFL brain, suspected of having CTE, did not. The sample was of NFL brains that were checked because they were thought to have CTE. Where is the control group of samples in the NFL?

      • >Correlation does not PROVE causation. It can however strongly imply causation

        Indeed. We need a properly controlled study of the following form:

        A) Cut the heads of all current NFL players and examine their brains.
        B) Cut the heads of a randomly selected group of people from the general populace and examine their brains.
        C) See if there's a statistically significant different.

        This will both teach us if violent sports cause CTE and free up the airwaves for better quality television than stupid sports.

        • by qbast ( 1265706 )
          Your properly controlled study fails to answer the question if football causes brain damage or if brain damage causes one to play football. So it still does not show any causation.
          • True.
            We could round up a random selection of people and force half of them to play in the NFL.
            Then chop all their heads off.

    • Don't be stupid (Score:5, Informative)

      by sjbe ( 173966 ) on Tuesday July 25, 2017 @10:45PM (#54879683)

      Correlation does not imply causation.

      Getting hit in the head is a proven cause of CTE. Professional football players get hit in the head commonly. Professional football players have CTE commonly. There is no other known cause of CTE aside from getting hit in the head. QED playing professional football is a common cause of CTE. The causal chain is quite intact here. The fact that some players manage to avoid brain injury while playing football does not change that causal chain.

    • by mvdwege ( 243851 )

      When, however, there is a possible causative agent (as pointed out below, concussions), then a correlation damn well does imply causation.

    • You shouldn't parrot things that you don't understand.

  • by rsilvergun ( 571051 ) on Tuesday July 25, 2017 @09:13PM (#54879289)
    you think somebody's gonna donate a perfectly good working brain? You can sell those on eBay or Craigslist for, like $30 bucks. I gave up trying to get human brains from thrift stores back in the early '00s. It wasn't worth my time to raise a corpse from the dead only to have the local villagers come round just because I used an "Abby Normal" brain.
  • known for a long time - let's see who wins now - $$ or common sense for self-preservation..

  • Correlation does not equal causation. Just because all professional NFL players appear to have brain damage, it does not mean that football causes brain damage.

    It could also mean that only a brain damaged person would play tackle football.

    • by arth1 ( 260657 )

      It could also mean that only a brain damaged person would play tackle football.

      Or that one way of getting through college if you have problems with your brain is through athletics programs.

      But most likely, the major bias here is that players with brain damage are the ones who are asked to donate their brains.

      • Or that one way of getting through college if you have problems with your brain is through athletics programs.

        It seems unlikely that you would find many who turned to athletics late enough for that to make sense actually getting to play on something like a football team. I'm under the assumption that it is well proven that most of the people playing a competitive college-level sport had to begin practicing at a fairly young age. I can't really imagine somebody saying, "Gosh, I'm sure struggling in biology class, I better apply for a football scholarship."

        So what is the causal chain to explain why there are so many

    • That's kinda like saying 99% of coal miners have black lung disease. Clearly that means only people who have a propensity for getting black lung disease become coal miners. How much evidence would you require?
    • by Roger W Moore ( 538166 ) on Tuesday July 25, 2017 @10:18PM (#54879579) Journal
      While what you say is true but there is considerable evidence [wikipedia.org] showing that the correlation is due to causation. It only occurs in sports where there is repetitive head injury and the effect is apparently similar to those produced when a head is subject to a "blast" and has not been immobilized first according to the Wikipedia page.
    • Correlation does not equal causation. Just because all professional NFL players appear to have brain damage, it does not mean that football causes brain damage.

      Very true. Maybe all of these football players also had something else in common, which happened to cause the brain damage.

      Oh hey, all of the football players had autopsies performed on them - maybe the autopsies caused the brain damage?

    • by sjbe ( 173966 ) on Tuesday July 25, 2017 @10:29PM (#54879617)

      Correlation does not equal causation. Just because all professional NFL players appear to have brain damage, it does not mean that football causes brain damage.

      Snark all you want but in this case this isn't mere correlation. The condition in question Chronic Traumatic Encephalopathy. Key word there is traumatic. You get that by being hit in the head and receiving brain damage as a result of being concussed. It's the exact same condition seen in boxers and MMA fighters and hockey players and rugby players and soldiers who get concussed repeatedly. So yes it absolutely does mean that playing football in the NFL is a cause for many players of serious brain injury. The fact that some players manage to avoid such injury does not mean that a cause/effect relationship is not in play. It simply means that some managed to avoid getting concussed during their playing career. Your claim is similar to saying smoking doesn't cause cancer because not every smoker gets cancer.

    • Not only that. This study may simply indicate that football players tend to develop CTE when they die, which isn't that worrying.

      • I doubt there is a single known case of anybody developing CTE when they die. It seems highly unlikely.

        You're going to need a brand new wild guess.

    • I just assumed most of them got the brain damage from their fathers. That's why they learned to like being hit in the head in first place, after all, and if your team is good you can even earn your father's love for a few hours a year.

      And some of us got to play baseball, which has different ethics regarding hitting each other.

    • Sure. And lung cancer causes smoking.

    • I know this is Slashdot so we have to point this out every time a correlative study comes out, but as stated above, correlated does imply causation. If there is no correlation you're not going to find causation. You generally have to do some more work after the correlation is elucidated to have conclusive evidence of causation, but if you already have a mechanism (ie, head trauma causes CTE) then you're most of the way there. It'd be a hard thing to get sample size for but it'd be awesome data to see CTE
  • Back in High School in the mid-70's, we (the High School bandies) had a saying ... "Duhhh Coach, tie my shoe."

    Of course we had a derogatory saying about drummers as well. My point is: did they check the brains before as well as after? It could just be that damaged brains like football.

    it only includes individuals who are exposed to head trauma by participation in football.

    Ahhh, so they're trying to link one to the other. Just because you've got it now and are literally in a head-banging sport, it would make sense, but are you absolutely sure they weren't damaged originally? My point sti

  • by Snotnose ( 212196 ) on Wednesday July 26, 2017 @12:54AM (#54880031)
    I have a feeling the NFL is on the way out. Thank god we told Spanos to take his ball and go home, let the saps in LA build his new stadium. Oh wait, it's some billionaire from St Louis who's gonna let Dean camp in his basement.

    Whatever, I'm glad we aren't on the hook for an expensive ego booster to some dinky dicked millionare.
  • I mean, american football players aren't necessarily rocket scientists or eloquent poets.
  • Repeatedly smacking the brain against the bone structure surrounding it will damage the brain. Brains are soft, bones are hard, if you smash the two together, it doesn't take a genius to figure out which takes more damage.
  • Not as violent (not including the fighting) but hits to the boards are quite more common per game that it makes me wonder if this is going to be a concern

  • by ledow ( 319597 ) on Wednesday July 26, 2017 @05:15AM (#54880567) Homepage

    "People who risk smashing their heads into the floor for a living can have noticeable differences in their brains"

    Not really surprising, is it? All the padding in the world doesn't absorb the shock of decelerations like that and your brain is a squidy thing inside a bit hard thing, with a bit of leeway and fluid.

    No matter how hard the eggshell, you can still break the yolk inside.

  • by John Allsup ( 987 ) <slashdot@chal i s q u e.net> on Wednesday July 26, 2017 @05:48AM (#54880649) Homepage Journal

    Reminds me of a religious conservative taking the age-at-death of a number of porn stars, taking its average, and comparing that with the average age-of-death in the US, totally oblivious to those pornstars who are still alive and the contribution of their ages-at-death, which are presently unknown.

    From an epidemiology perspective, the 99% is, of course, useless. It's like saying that 99% of people who had terminal cancer died of cancer.

    On the other hand, (and why the fuck isn't this angle being spelt out more??), you have a reasonable number of brains to look at, from which you can infer ways to recognise where the brain injuries come from, and use this to better understand how often these problems occur in general. For example the questions that should be asked are about what sort of tests can we come up with to detect this sort of brain injury sooner.

  • I wonder how much of "correlation is not causation" is at play here -

    do they get the damage through playing, or do people with that specific sort of brain damage are especially apt at Football?

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