4. Systematic reviews and meta analysis.

	Zhang 2015		Park 2013		Lu 2015		Bogani 2014
		P value		P value		P value		P value
Number of studies	8		11		11		6
OR length of hospital stay	0.433 (0.215‐0.869)	0.019	‐		‐4.87 (‐7.26, ‐2.47)**	<0.00001	‐3.30 (‐3.92, ‐2.69)**	<0.00001
OR recurrence rates	0.707 (0.245‐2.037)	0.521	0.099 (0.067‐0.144)*	<0.001	0.32 (0.13‐0.82)	0.02	0.50 (0.21‐1.21)	0.13
OR of upstaging rates	‐	‐	0.669 (0.246‐1.815)	0.430	‐	‐	0.70 (0.38‐1.27)	0.24
OR intra‐operative complications	‐	‐	‐	‐	1.34 (0.37‐4.93)	0.66	2.47 (0.50‐12.22)	0.27
OR postoperative complications	‐	‐	‐	‐	0.26 (0.13‐0.52)	0.000	0.25 (0.12‐0.53)	0.0003
OR complications	0.433 (0.215‐0.869)	0.019	‐	‐	‐	‐	‐	‐

*Event rate

**Mean difference