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Table 4 Egg-trap based monitoring of Aedes aegypti: summary statistics

From: Measuring mosquito control: adult-mosquito catches vs egg-trap data as endpoints of a cluster-randomized controlled trial of mosquito-disseminated pyriproxyfen

Metric Statistic CC IC Total
BP IP Subtotal BP IP Subtotal
Sampling effort (in 60 dwellings over 16 months)
Egg-traps set Sum 168 767 935 167 777 944 1879
Aedes egg-trap positivity
Egg-traps positive Sum 54 172 226 32 130 162 388
Percent 32.14 22.43 (− 30%)a 24.17 19.16 16.73 (− 13%)a 17.16 20.65
95% CI (lower) 25.55 19.62 21.54 13.91 14.27 14.89 18.88
95% CI (upper) 39.54 25.51 27.02 25.8 19.52 19.70 22.54
Aedes aegypti eggs in egg-traps
Total eggs Sum 3619 13,617 17,236 2224 10,931 13,155 30,391
Eggs per egg-trapb Mean 21.54 17.75 (− 18%)a 18.43 13.32 14.07 (+ 6%)a 13.93 16.17
SD 57.27 55.34 55.68 51.46 44.60 45.86 51.02
Median 0 0 0 0 0 0 0
IQR 0–20.25 0–0 0–0 0–0 0–0 0–0 0–0
Maximumc 567 506 567 567 465 567 567
  1. aThe percent change in each key metric (highlighted in bold typeface) between the baseline period and the intervention period is given in brackets; trap positivity decreased moderately in both in the IC and in the CC, and eggs per egg-trap decreased in the IC but increased slightly in the CC
  2. bValues computed across the results of individual sampling occasions
  3. cIn all cases, the minimum number of Aedes aegypti eggs per egg-trap was zero
  4. Abbreviations: CC, control cluster; IC, intervention cluster; BP, baseline period; IP, intervention period; 95% CI, 95% score confidence interval (lower/upper limits); SD, standard deviation; IQR, inter-quartile range