The Facts Prove Otherwise: The Times misunderstood and misconstrued the studies and their methodology. Certain parts of the Committee's published MTBI studies were based on a data set that drew from two separate sources -- the NFL Injury Surveillance System that collected simple data regarding concussions, and a set of forms that the teams were asked to provide to the League that provided additional factual detail about each such concussion. All 30 clubs reported concussions between 1996 – 2001 through the NFL's injury surveillance system, although one or more clubs did not report concussions in a particular season. The MTBI studies made clear that the data set they used comprised concussive events where both sets of information were provided because the information from the Injury Surveillance System alone was not sufficient to provide the information necessary for the study. As a result, the data set on which the MTBI studies were based was by definition smaller than the data set from the surveillance system alone because there were instances where a concussion event was reported through the surveillance system but the team did not provide the necessary initial and/or follow-up forms.