Risk factors for malaria infection prevalence and household vector density between mass distribution campaigns of long-lasting insecticidal nets in North-western Tanzania

Table 3 Risk factors associated with vector density in the univariate and multivariate models

	Number of HH	Indoor vector density	Univariate			Multivariate
	Number of HH	Indoor vector density	IRR	96% CI	p-value	IRR	96% CI	p-value
Altitude (metres)
1133–1242	192	63.2	1			1
1243–1302	191	22.6	0.63	0.49–0.80	< 0.001	0.58	0.46–0.74	< 0.001
1303–1373	192	6.8	0.51	0.40–0.66	< 0.001	0.44	0.33–0.58	< 0.001
1374–1651	191	5.7	0.39	0.29–0.51	< 0.001	0.35	0.27–0.46	< 0.001
Wind during collection
None/light	433	28.2	1			1
Moderate/strong	335	19.9	0.77	0.64–0.93	0.007	0.69	0.57–0.83	< 0.001
Livestock
No	267	17.5	1			1
Yes	502	28.3	1.13	0.95–1.35	0.159	1.35	1.12–1.62	0.001
Improved housing structure
No	579	29.3	1			1
Yes	183	10.1	0.78	0.63–0.95	0.016	0.83	0.67–1.02	0.072
Household using at least 1 LLIN
No	264	22.9	1			1
Yes	505	25.4	0.79	0.66–0.93	0.006	0.78	0.66–0.92	0.004
Number of rooms	770	24.9	0.89	0.84–095	< 0.001	0.90	0.84–0.96	0.001
Household cooks inside the house
No	620	23.3	1
Yes	149	29.6	1.31	1.07–1.59	0.010
Total time house has been sprayed	756	24.9	0.94	0.90–0.99	0.011
Animal inside the house
No	308	29.2	1
Yes	196	26.5	1.01	0.82–1.25	0.933
Rain during collection
None	435	23.7	1
Light	164	37.1	0.98	0.78–1.24	0.894
Heavy	169	14.5	1.15	0.92–1.44	0.234
Eaves of the house
Closed	324	22.9	1
Open	445	25.7	1.17	0.99–1.38	0.071

ISSN: 1475-2875