Table 3.

Relative risk results of the systematic review. Note: Pawar and colleagues (the SAMITAL study) were excluded due to low N and methodological uncertainty.

Study	N	Lower CI	Upper CI	Relative risk
Bao et al. [21]	124	0.54	3.29	1.34
Belcaro et al. [22]	80	0.75	5.33	2.00
Brooker et al. [23]	66	0.80	1.13	0.95
Costa Fortes et al. [24]	56	0.25	0.81	0.45
Pawar et al. [27]	(27)	N/A	N/A	N/A
Pommier et al. [25]	254	0.49	0.89	0.66
Tröger et al. [26]	220	0.70	0.90	0.79
Average	800	0.59	2.06	1.03