Table 2. Summary ORs or RRs and 95% CI of IOUS associated negative margins.

Presentation	Types of study	Summary ORs/RRs	95% CI	P value for heterogeneity
Both	Prospective	1.63*	1.10–2.42	0.010
		1.37	1.18–1.59	0.117
	Retrospective	2.42*	1.45–3.19	0.122
		2.75	1.66–4.55	0.193
Non-palpable	Prospective	1.47*	0.98–2.22	0.030
		1.26	1.09–1.46	0.334
	Retrospective	1.45	0.86–2.43	0.583
Palpable	Prospective	2.36	1.26–4.43	0.361
	Retrospective	2.71	1.25–5.87	0.146

^*ORs or RRs was meta-analyzed with publication bias.