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Table 2 Indoor resting density using pyrethrum spray catches and incidence rate ratios in intervention and control groups of Anopheles arabiensis in Adami Tullu, Ethiopia

From: Impact of combining indoor residual spraying and long-lasting insecticidal nets on Anopheles arabiensis in Ethiopia: results from a cluster randomized controlled trial

Study arms Person-night catch Mean density (95% CI) IRR (95% CI) P value
a) Control arm is the reference group
 Control 560 0.19 (0.13–0.29)   
 IRS 560 0.02 (0.01–0.07) 0.111 (0.033–0.374) < 0.001
 LLIN 560 0.34 (0.24–0.47) 1.740 (1.026–2.951) 0.040
 IRS + LLIN 560 0.06 (0.03–0.12) 0.296 (0.130–0.675) 0.004
b) IRS + LLIN arm is the reference group
 IRS + LLIN 420 0.06 (0.03–0.12)   
 IRS 420 0.02 (0.01–0.07) 0.375 (0.097–1.443) 0.154
 LLIN 420 0.34 (0.24–0.47) 5.376 (2.406–12.013) < 0.001
  1. IRS indoor residual spray, LLIN long-lasting insecticidal nets, PSC pyrethrum spray catches