Table 4. Container characteristics significantly associated^a with the number of pupae per container identified in the multi-variate analysis of risk factors for dengue vector breeding during wet and dry season in private premises (outdoor and indoor).

	Wet season			Dry season
Container	IRRb	95% CI	P-value	IRRb	95% CI	P-value
not under shrubbery	Reference			Reference
fully or partially under shrubbery	0.51	0.33–0.78	0.002	0.50	0.25–0.98	0.045
used during past 7 days	Reference			Reference
not used during past 7 days	6.74	4.37–10.37	<0.001	2.39	1.26–4.52	0.007
fully covered	Reference			Reference
partially covered	3.79	1.53–9.34	0.004	7.95	2.53–24.92	<0.001
not covered	2.58	1.27–5.21	0.008	2.90	1.30–6.47	0.009

^a Results of negative binomial regression with clustering at the study cluster level.

^b Incidence rate ratio. Example: the expected pupal count for containers not used in the past 7 days is 6.74 times higher than that for containers used in the past 7 days.