. 2015 Sep 29;14:374. doi: 10.1186/s12936-015-0865-2

Table 1.

Associations between measures of urbanicity and the household density of mosquitoes stratified by study site

Urbanicity metric	Exposure categories	Walukuba			Kihihi			Nagongera
Urbanicity metric	Exposure categories	HDM (nights of collection)^a	IRR^b (95 % CI)	P	HDM (nights of collection)^a	IRR^b (95 % CI)	P	HDM (nights of collection)^a	IRR^b (95 % CI)	P
Household density^c	≤80	2.08 (327)	0.30 (0.16–0.59)	<0.001	4.68 (2086)	0.68 (0.28–1.64)	0.39	43.3 (2329)	N/A
Household density^c	>80	0.90 (1857)	0.30 (0.16–0.59)	<0.001	3.58 (166)	0.68 (0.28–1.64)	0.39	None	N/A
NDVI^d	>0.45	1.85 (707)	0.35 (0.21–0.57)	<0.001	4.78 (1704)	0.83 (0.48–1.42)	0.49	41.1 (1660)	1.16 (0.87–1.54)	0.32
NDVI^d	≤0.45	0.71 (1477)	0.35 (0.21–0.57)	<0.001	4.04 (548)	0.83 (0.48–1.42)	0.49	48.7 (669)	1.16 (0.87–1.54)	0.32
Night-time lights	≤3	1.33 (1526)	0.32 (0.19–0.55)	<0.001	4.60 (2252)	N/A		43.3 (2329)	N/A
Night-time lights	>3	0.49 (658)	0.32 (0.19–0.55)	<0.001	None	N/A		None	N/A
Land cover	≤20 %	1.37 (1265)	0.42 (0.26–0.69)	0.001	Not measured			Not measured
Land cover	>20 %	0.68 (919)	0.42 (0.26–0.69)	0.001	Not measured			Not measured
Composite score^e	Low	1.37 (1501)	0.28 (0.17–0.48)	<0.001	4.68 (2086)	0.68 (0.28–1.64)	0.39	43.3 (2329)	N/A
Composite score^e	High	0.44 (683)	0.28 (0.17–0.48)	<0.001	3.58 (166)	0.68 (0.28–1.64)	0.39	None	N/A

^aHousehold density of mosquitoes (number of adult female anophelines caught per nights of collection)

^bIncidence rate ratio

^cNumber of households within 100 m radius from participating household

^dNormalized difference vegetation index

^e1 point for each individual urbanicity metric: Walukuba (low = 0–2, high = 3–4), Kihihi and Nagongera (low = 0–1, high = 2)