Table 3.

Concentration indexes for comparison and intervention districts

	(1) Comparison	(2) Intervention	(3) Difference	(4) ta	(5) p
Knowledge of malaria
Mosquito bites cause malaria	0.129	0.069	0.059	3.51	0.009
Knowledge of nets and treatment
Familiar with mosquito nets	0.050	0.013	0.037	5.03	0.002
Ever heard of insecticide treatment	0.366	0.131	0.235	6.54	0.001
ITN kills or repels mosquitoes	0.376	0.129	0.247	5.80	0.002
Know that ITN needs re-treatment	0.675	0.182	0.493	8.92	0.000
No disadvantages to ITN	0.388	0.144	0.243	4.73	0.005
Ever heard of PowerNET	0.483	0.084	0.399	10.92	0.001
Ever heard of POWERCHEM	0.702	0.246	0.455	10.59	0.000
Access to mosquito nets
Access to mosquito nets (in minutes)	-0.151	-0.132	-0.019	-0.77	0.768
Access to nets in 15 minutes or less	0.423	0.166	0.257	5.28	0.003
Beliefs about malaria protection
One can protect oneself from malaria	0.108	0.068	0.041	2.41	0.030
One can protect by using a net	0.332	0.126	0.205	5.76	0.001
One can protect by using an ITN	0.549	0.279	0.270	2.23	0.056
Behaviour
Number of mosquito nets in household	0.637	0.434	0.203	7.05	0.000
Number of ITNs owned by household	0.726	0.400	0.326	8.43	0.000
Ever had ITN in household	0.709	0.339	0.370	8.95	0.000
Ever bought PowerNET	0.721	0.359	0.362	9.75	0.000
Ever bought POWERCHEM	0.749	0.399	0.350	6.52	0.000
Usually sleeps under a net	0.608	0.374	0.234	5.80	0.001

^a: t-statistic with $df=\frac{5{\left(s_c^2+s_i^2\right)}^2}{{\left(s_c^2\right)}^2+{\left(s_i^2\right)}^2}-2$, one-tailed.