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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