Table 2

The patient characteristics of the included studies
Sample size Mean age Gender(M/F)
Op N-op Op N-op Op N-op
Nikku et al. 1997, 2005 [23,24]; 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

M: Male; F: Female; Op: Operative; N-op: Non-operative.

Cheng et al.

Cheng et al. Diagnostic Pathology 2014 9:60   doi:10.1186/1746-1596-9-60

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