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Correction: Persistent effects of playing football and associated (subconcussive) head trauma on brain structure and function: a systematic review of the literature

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Table 2 (section: Category†) contained some errors. The correct version of the table is as follows.

Table 2 Summary information about included studies (n=30)

Studies (n, (%))Female football players (n (%))Male football players (n (%))All football players (n (%))
Control of type-1 errors
 Appropriate12 (40.0)104 (27.4)414 (31.6)518 (30.6)
 Inappropriate / unclear18 (60.0)275 (72.6)898 (68.4)1173 (69.4)
 Total30 (100.0)379 (100.0)1312 (100.0)1691 (100.0)
Selection of controls
 Appropriate12 (40.0)12 (11.1)224 (54.2)236 (45.3)
 Inappropriate / unclear8 (26.7)96 (88.9)189 (45.8)285 (54.7)
 NA10 (33.3)N/AN/AN/A
 Total30 (100.0)108 (100.0)413 (100.0)521 (100.0)
Response rate*
 High (>50%)7 (23.3)0 (0.0)462 (35.2)462 (27.3)
 Low (≤50%)3 (10.0)0 (0.0)135 (10.3)135 (8.0)
 Not reported20 (66.7)379 (100.0)715 (54.5)1094 (64.7)
 Total30 (100.0)379 (100.0)1312 (100.0)1691 (100.0)
Gender
 Football playersN/A379 (22.4)1312 (77.6)1691 (100.0)
 Control subjectsN/A108 (20.7)413 (79.3)521 (100.0)
Category†
 NCT2336511531518
 Case-control studies1414-16 27-29 31 34 37 38 47 52 57 59 56525581
 Impact of heading1712-19 28 29 32 34 37 52 53 57 59 3108631173
 Impact of head-injuries1313-19 27 31-33 49 52 2938101103
 Neuroimaging817 37 38 44 48 50 51 54 22121143
 EEG255 56 0106106
 Postural control137 01515
Level of play‡
 Youth3 (10.0)69 (18.2)100 (7.6)169 (10.0)
 High-school / college9 (30.0)280 (73.9)234 (17.8)514 (30.4)
 University3 (10.0)22 (5.8)47 (3.6)69 (4.1)
 Amateur2 (6.7)8 (2.1)62 (4.7)70 (4.1)
 Professional8 (26.7)0 (0.0)677 (51.6)677 (40.0)
 Former professional5 (16.7)0 (0.0)192 (14.6)192 (11.4)
 Total30 (100.0)379 (100.0)1312 (100.0)1691 (100.0)
  • *Fraction of participants that …

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