Table 4.

Overview of meta-analyses results.

Outcome or subgroup	Studies	Subjects/incisions	Effect estimate OR (95% CI)	p	I 2
Overall	6	733	3.06 (2.05, 4.58)	<0.00001	0%
High risk	4	538	3.22 (1.79, 5.78)	<0.0001	32%
Normal risk	2	195	2.62 (1.20, 5.72)	0.02	0%
Szilagyi I	4	568	3.09 (1.68, 5.67)	0.0003	0%
Szilagyi II	4	568	1.92 (0.34, 10.82)	0.46	67%
Szilagyi III	4a	568	3.01 (0.93, 9.77)	0.07	0%

I² = measure of heterogeneity. Bold p values indicate statistically significant p value.

^aOne study in the Szilagyi III analysis reported no events in either the ciNPT or control group.