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Table 3 Cluster t-tests of differences in PHI and PPI between intervention and control clusters in rainy and dry seasons

From: Pupal productivity in rainy and dry seasons: findings from the impact survey of a randomised controlled trial of dengue prevention in Guerrero, Mexico

  Rainy season Dry season
PHI
  Overall mean = 0.58 Overall mean = 0.61
  Intervention clusters Control clusters Intervention clusters Control clusters
Mean 0.46 0.82 0.41 0.83
Proportion of households above overall mean 0.07 0.11 0.06 0.10
Difference in proportion of households above mean between intervention and control clusters - 0.04 - 0.04
Cluster adjusted 95% CI of difference −0.065 to −0.012 −0.065 to −0.007
t value 2.961 2.294
Degrees of freedom 88 88
P value p = 0.004 p = 0.024
PPI
  Overall mean = 0.17 Overall mean = 0.20
  Intervention clusters Control clusters Intervention clusters Control clusters
Mean 0.11 0.19 0.10 0.20
Proportion of households above overall mean 0.03 0.05 0.03 0.05
Difference in proportion of households above mean between intervention and control clusters - 0.02 −0.02
Cluster adjusted 95% CI of difference −0.034 to −0.003 −0.042 to −0.006
t value 2.290 2.500
Degrees of freedom 88 88
P value p = 0.024 p = 0.014
  1. PHI pupae per household index, PPI pupae per person index