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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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Correction
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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https://doi.org/10.1136/bjsports-2016-096593corr1

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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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