weakly significantP = 0.03
The relative odds of bug infection stratified by intervention period was 5.5-fold (95% CI: 4.28–7.06) greater when a domestic infestation was detected rather than when it was not (MH χ 2 = 224.8, df = 1, P < 0.001), with weakly significant heterogeneity between periods (homogeneity χ 2 = 7.3, df = 1, P = 0.03).