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

Table 1 Adult-mosquito catches using battery-powered aspirators: summary statistics

Metric	Statistic	CC			IC			Total
Metric	Statistic	BP	IP	Subtotal	BP	IP	Subtotal	Total
Sampling effort (in 60 dwellings over 16 months)
Sampling occasions	Sum	90	388	478	90	389	479	957
Minutes of aspiration	Sum	1049	4325	5374	859	4034	4893	10,267
All-mosquito catches (Aedes + Culex)
Total caught	Sum	620	2856	3476	412	468	880	4356
Mosquitoes per 10 min aspiration^a	Mean	5.81	5.09 (− 12%)^b	5.22	3.63	1.14 (− 69%)^b	1.60	3.41
	SD	12.96	18.84	17.87	8.65	3.92	5.23	13.28
	Median	2.11	1.25	1.43	1.11	0.00	0.00	0.00
	IQR	1.00–5.00	0.00–4.00	0.00–4.53	0.00–3.56	0.00–0.91	0.00–1.25	0.00–2.50
	Maximum^c	98.75	322.50	322.50	74.17	43.33	74.17	322.50
Aedes aegypti catches
Total caught	Sum	94	217	311	275	197	472	783
Aedes per 10 min aspiration^a	Mean	0.99	0.52 (− 47%)^b	0.61	2.54	0.48 (− 81%)^b	0.87	0.74
	SD	1.74	1.29	1.40	8.13	1.75	3.93	2.95
	Median	0.25	0.00	0.00	0.00	0.00	0.00	0.00
	IQR	0.00–1.33	0.00–0.43	0.00–0.76	0.00–2.00	0.00–0.00	0.00–0.50	0.00–0.67
	Maximum^c	11.67	10.00	11.67	72.50	23.33	72.50	72.50
Culex quinquefasciatus catches
Total caught	Sum	526	2639	3165	137	271	408	3573
Culex per 10 min aspiration^a	Mean	4.82	4.57 (− 5%)^b	4.62	1.09	0.66 (− 39%)^b	0.74	2.68
	SD	12.32	18.70	17.67	2.40	2.94	2.85	12.79
	Median	1.43	0.56	0.72	0.00	0.00	0.00	0.00
	IQR	0.00–4.47	0.00–3.08	0.00–3.33	0.00–1.11	0.00–0.00	0.00–0.00	0.00–1.67
	Maximum^c	96.25	322.50	322.50	15.38	38.00	38.00	322.50

^aValues computed across the results of individual sampling occasions
^bThe percent change in mean mosquito catch (highlighted in bold typeface) between the baseline period and the intervention period is given in parentheses; note that, although the change was always a decrease (hence the minus signs), the decrease was always much larger in the IC than in the CC
^cIn all cases, the minimum number of adult mosquitoes caught per 10 min aspiration was zero
Abbreviations: CC, control cluster; IC, intervention cluster; BP, baseline period; IP, intervention period; SD, standard deviation; IQR, inter-quartile range

ISSN: 1756-3305