Table 9. Effect of using a net conditional on district and effect of district conditional on net use on the risk of clinical malaria.

Comparisons that were statistically significant a p<0.05 are indicated in bold.

	Baseline		Post IRS 1		Post IRS 2
Parameter	OR	p	OR	p	OR	p
Net use conditional on district (non-IRS district):
Use a net (Yes)	0.45 (0.19, 1.05)	0.065	1.75 (0.77, 3.96)	0.182	0.50 (0.29, 0.86)	0.011
Use a net (No)	1.00	Ref.	1.00	Ref.	1.00	Ref.
Net use conditional on district (IRS district):
Use a net (Yes)	0.22 (0.08, 0.62)	0.005	0.05 (0.01, 0.41)	0.005	1.08 (0.42, 2.78)	0.873
Use a net (No)	1.00	Ref.	1.00	Ref.	1.00	Ref.
District conditional on net use (Use a net = Yes)
District (IRS)	0.62 (0.23–1.66)	0.340	0.06 (0.01–0.48)	0.007	0.62 (0.25–1.51)	0.291
District (non-IRS)	1.00	Ref.	1.00	Ref.	1.00	Ref.
District conditional on net use (Use a net = No)
District (IRS)	1.25 (0.51–3.07)	0.626	2.27 (0.79–6.52)	0.128	0.29 (0.14–0.61)	0.001
District (non-IRS)	1.00	Ref.	1.00	Ref.	1.00	Ref.