Impact of promoting longer-lasting insecticide treatment of bed nets upon malaria transmission in a rural Tanzanian setting with pre-existing high coverage of untreated nets

Table 3 The parity and sibling species composition of the Anopheles gambiae complex populations in averaged across Idete and Namawala villages

Year	Proportion (n/total)	Odds ratio [95% CI]	p value
*Parity*
1990-1994^a	0.62 (9,690/15,541)	1.00	NA
2001-2003^b	0.47 (2,995/6,372)	0.535 [0.504, 0.568]	<0.0001
2008	0.51 (448/641)	0.422 [0.372, 0.478]	<0.0001
*Sibling A. gambiae sensu stricto*
1990-1994^a	0.46 (101/220)	1.00	NA
2001-2003^b	0.38 (60/157)	0.812 [0.532, 1.240]	0.336
2008	0.14 (584/4080)	0.196 [0.148, 0.260]	<0.0001

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