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Table 3 Proportion of households that purchased anti-mosquito products, and expenditure during the last month among those who purchased the products, in trial intervention and control sites surveyed in August–November 2012

From: Household costs for personal protection against mosquitoes: secondary outcomes from a randomised controlled trial of dengue prevention in Guerrero state, Mexico

  Intervention clusters Control clusters Difference of proportions (95%CIca)
Surveyed households 5349 5142  
Proportion of households that purchased anti-mosquito productsa 47.8% (2530/5293) 53.3% (2707/5079) −0.05 (−0.1 to −0.01)
Among households spending anything
 Mean expenditure in the last month (USD) 6.0 (SD 5.9) 6.83 (SD 6.84)  
Proportion spending more than the mean of USD 6.43b 30.4% (768/2530) 36.7% (993/2707) −0.06 (−0.12 to −0.01)
Among all households
 Mean expenditure in the last month (USD) 2.86 (SD 5.12) 3.65 (SD 6.04)  
Proportion spending more than the mean of USD 3.25c 30.6% (1622/5293) 37.5% (1906/5079) −0.07 (−0.09 to −0.05)
  1. aCluster t-test. t = −2.193, df 88 p = 0.031
  2. bCluster t-test. t = −1.978, df 88, p = 0.05
  3. cCluster t-test. t = −2.653, df 88, p = 0.009