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

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

 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
Difference95%-confidence intervalp-valueDifference95%- confidence intervalp-valueDifference95%- confidence intervalp-value
baseline7.8%[−0.2│15.8]p = 0.0550.8%[−7.4│9.0]p = 0.8437.0%[0.1│14.0]p = 0.049
cohort3.5%[−2.5│9.5]p = 0.2410.8%[−5.4│7.0]p = 0.7852.7%[−2.6│7.9]p = 0.305
  1. Note: a only studies reporting both baseline and cohort SSI rates