Sample size | Mean age | Gender(M/F) | ||||
---|---|---|---|---|---|---|
Op | N-op | Op | N-op | Op | N-op | |
70 | 57 | 20 | 20 | 18/52 | 27/30 | |
Palmu et al. 2008 [25]; | 36 | 28 | 13 | 13 | 9/27 | 9/19 |
Christiansen et al. 2008 [26]; | 42 | 35 | 20 | 19.9 | 24/18 | 18/17 |
Sillanpää et al. 2008 [8]; | 18 | 22 | 20 | 20 | 17/1 | 20/2 |
Camanho et al. 2008 [2]; | 17 | 16 | 24.6 | 26.8 | 6/11 | 7/9 |
Bitar et al. 2012 [9]; | 21 | 20 | 23.9 | 24.1 | 9/12 | 11/9 |
Petri et al. 2012 [7]; | 12 | 8 | 27.2 | 21.6 | 8/4 | 5/3 |