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Table 3 Outdoor resting density using artificial pit shelter 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

Mosquito collection method and study arms Collection nights Mean density (95% CI) IRR (95% CI) p-value
a) Control arm is the reference group
 Control 224 0.18 (0.09–0.35)   
 IRS 224 0.14 (0.07–0.30) 0.800 (0.294–2.177) 0.662
 LLIN 224 0.43 (0.27–1.69) 2.398 (1.051–5.479) 0.038
 IRS + LLIN 224 0.04 (0.01–0.15) 0.200 (0.042–0.954) 0.044
b) IRS + LLIN arm is the reference group
 IRS + LLIN 168 0.04 (0.01–0.15)   
 IRS 168 0.14 (0.07–0.30) 3.998 (0.813–19.668) 0.088
 LLIN 168 0.43 (0.27–1.69) 12.001 (2.707–53.196) < 0.001
  1. IRS indoor residual spray, LLIN long-lasting insecticidal nets, PIT outdoor artificial pit shelter