Table 3.

Stepwise linear regression of the mean number of Anopheles gambiae captured per house by PSC versus the surface area of the different land uses within the optimized buffer around the villages centroids^*

	Coefficient	Standard error	t	P > t	95% Confidence interval
August
Late rice	0.610	0.0070	8.70	0.000	0.047–0.076
Garden	−0.020	0.0102	−2.01	0.057	−0.042–0.001
Zone	−72.020	22.2477	−3.24	0.004	−118.160–−25.882
October
Early rice	−0.001	0.0002	−3.76	0.001	−0.002–−0.000
Year	−3.910	0.9715	−4.02	0.001	−5.920–−1.900
April 2000
Bare	−0.001	0.0003	−5.33	0.000	−0.002–−0.001
January 2001
Rice	0.002	0.0008	2.97	0.009	0.001–0.004

^*Year and zone were included as cofactors. PSC = pyrethrum spray catch.