TY - JOUR T1 - Correction: <em>Persistent effects of playing football and associated (subconcussive) head trauma on brain structure and function: a systematic review of the literature</em> JF - British Journal of Sports Medicine JO - Br J Sports Med SP - e8 LP - e8 DO - 10.1136/bjsports-2016-096593corr1 VL - 52 IS - 20 A2 - , Y1 - 2018/10/01 UR - http://bjsm.bmj.com/content/52/20/e8.abstract N2 - 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 (&gt;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 01515Level 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 … ER -