Table 2.

Impact of IRS and LLIN on the prevalence of malaria in Zambia, 2006 to 2011

	Total prevalence	Severe malaria	Deaths due to malaria
	PRR* (95% CI)	PRR (95% CI)	PRR (95% CI)
IRS (per 1,000 household coverage)
0	1	1	1
<500	1.19 (1.19–1.20)	1.33 (1.32–1.34)	1.12 (1.07–1.17)
≥500	1.49 (1.49–1.50)	1.49 (1.48–1.50)	1.54 (1.46–1.62)
LLIN (per two household residents coverage)
<1	1	1	1
≥1	0.91 (0.90–0.91)	0.89 (0.88–0.89)	0.96 (0.92–1.00)
Year
2006	1	1	1
2007	0.89 (0.89–0.90)	0.87 (0.86–0.87)	0.94 (0.90–0.97)
2008	0.61 (0.61–0.62)	0.58 (0.57–0.58)	0 .54 (0.51–0.57)
2009	0.58 (0.57–0.58)	0.63 (0.62–0.63)	0.61 (0.59–0.65)
2010	0.72 (0.71–0.72)	0.74 (0.73–0.74)	0.61 (0.58–0.65)
2011	0.74 (0.73–0.74)	0.60 (0.59–0.60)	0.55 (0.52–0.58)

*PRR = Prevalence rate ratio.