Table 1

Characteristics of total sample and sample after users removed due to cleaning in Stroop (online supplemental material 1). Some characteristics are only asked to those identified as having certain risk factors and subsample numbers and rationale is given.

Included sampleTotal population
Demographics (everybody asked)n=2120n=2235
AgeMean (SD)49.6 (13.9)50.0 (14.1)
Medical history (everybody asked)n=2120n=2235
Any concussionDon’t know5% (110)5% (116)
No71% (1511)71% (1596)
Yes24% (499)23% (523)
Any neurological conditionDon’t know5% (105)5% (108)
No79% (1683)79% (1773)
Yes16% (332)16% (354)
DementiaNot reported99% (2107)99% (2219)
Yes1% (13)1% (16)
Risk factors n=2120n=2235
Smoking statusCurrently12% (251)12% (272)
Never58% (1232)58% (1297)
Past30% (637)30% (666)
Alcohol intakeCurrently73% (1556)73% (1625)
Never8% (166)8% (186)
Past19% (398)19% (424)
Self-reported forgetfullnessNot forgetful92% (1955)92% (2054)
Forgetful8% (165)8% (181)
Asked to anyone reporting negative emotion or concussion n=1162n=1231
Self-reported functional impairmentMean (SD)1.5 (1.4)1.6 (1.4)
Asked to anyone consuming >7 drinks a week n=474n=495
CAGENon-dependant (<3)75% (355)76% (375)
Dependant (≥3)25% (119)24% (120)