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Table 2 House Index in households with regular and irregular water supply, in intervention and control sites, Managua, January 2013

From: Informed community mobilization for dengue prevention in households with and without a regular water supply: Secondary analysis from the Camino Verde trial in Nicaragua

Water supply Intervention sites Control sites Impact of intervention
OR (95% CI of OR); NNT (95% CI of NNT)a
No. households No. (%) positive for larvae/pupae No. households No. (%) positive for larvae/pupae
Regular supply 2028 243 (12) 2031 396 (20) 0.7 (0.5–1.0); 24 (12–251)
Irregular supply 2015 322 (16) 2016 572 (28) 0.6 (0.4–0.8); 11 (7–36)
Association with regularity of water supply: OR (95% CI of OR); NNT (95% CI of NNT)a
All sites Intervention sites Control sites  
0.7 (0.6–0.8); 19 (13–35) 0.7 (0.6–0.9); 29 (16–103) 0.6 (0.5–0.8); 14 (9–24)  
  1. aOdds Ratio and 95% confidence interval; number needed to treat and 95% confidence interval. Both OR and NNT from GLMM, with cluster as random effect. In addition to regularity of water supply or intervention status, observed presence of temephos remained in the final models