No significant difference was recorded in the density of vector mosquitoes caught in light traps in houses over the two transmission seasons ; the mean number of A gambiae sensu lato mosquitoes per trap per night was 6.7 ( 4.0-10 .1 ) in the LLIN group and 4.5 ( 2.4-7 .4 ) in the indoor residual spraying plus LLIN group ( p = 0.281 in the random-effects linear regression model ) .