Table 1.

Observed and expected number of mixed swarms.

	indoor composition		swarm composition mix / total
year	nb	M//S (%)	observedc	n	expectedd	pd
Aug–Sep 2006	394	54//46	0 / 46	901	45.7	<0.0001
Aug–Sep 2007a	169	30//70	1 / 21	243	19.7	<0.0001

^aA single collection was obtained in 2006, 2 weeks after collection of the first swarm, coinciding with the collection of the last swarms. The two collections in 2007 (1–2 September and 13–14 September) were pooled because there was no significant difference in form composition between them (χ² = 1.8208; d.f. = 1; p > 0.17).

^bTotal number of mosquitoes collected. Indoor samples include males and females pooled because there was no significant difference between them (p > 0.1). Swarm samples consisted of males only.

^cThe number of mixed swarms of the total number of swarms sampled.

^dExpected number of mixed swarms based on binomial samples drawn from a population with corresponding indoor form composition. Each sample represents a swarm and is of the same sample size as that swarm. Ten thousand simulated sets of swarm samples, each representing the same number of swarms (and the same number of mosquitoes from each swarm) as the actual collection of swarms, were used to enumerate the mixed swarms expected. A mixed sample has at least one member of each swarm (without regard to degree of mixing).