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

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

Metric	Statistic	CC			IC			Total
Metric	Statistic	BP	IP	Subtotal	BP	IP	Subtotal	Total
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-trap^b	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
	Maximum^c	567	506	567	567	465	567	567

^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
^bValues computed across the results of individual sampling occasions
^cIn all cases, the minimum number of Aedes aegypti eggs per egg-trap was zero
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

ISSN: 1756-3305