Implementation interventions in preventing surgical site infections in abdominal surgery: a systematic review

Table 4 Tests for significance of differences in baseline and cohort SSI rates between N = 31 studies^a with different numbers of implementation interventions

	Studies with 3–5 vs. 1–2 implementation interventions			Studies with 6–8 vs. 1–2 implementation interventions			Studies with 3–5 vs. 6–8 implementation interventions
	Difference	95%-confidence interval	p-value	Difference	95%- confidence interval	p-value	Difference	95%- confidence interval	p-value
baseline	7.8%	[−0.2│15.8]	p = 0.055	0.8%	[−7.4│9.0]	p = 0.843	7.0%	[0.1│14.0]	p = 0.049
cohort	3.5%	[−2.5│9.5]	p = 0.241	0.8%	[−5.4│7.0]	p = 0.785	2.7%	[−2.6│7.9]	p = 0.305

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