Table 6.

Final linear model^† of pHI, Waspam, Nicaragua (n = 163 nets)

Variable	Coefficient (95 % CI)	p-value
Intercept	1.336 (0.673–1.999)	< 0.001*
Collection time point (ref: six months)
12 months	0.105 (-0.455–0.666)	0.71
24 months	0.513 (-1.139–2.165)	0.54
36 months	1.650 (0.817–2.485)	< 0.001*
No. of people sleeping in the home the night before the survey (ref: 0–4 people)
5–9 people	− 0.705 (− 1.280– − 0.130)	0.02*
10 + people	− 0.179 (− 0.839–0.480)	0.59
Water source used to wash net (ref: Piped water)
Well water	0.026 (− 0.296–0.349)	0.87
River water	0.345 (− 0.070–0.760)	0.10
Washed > 6 times (ref: No)
Yes	0.220 (− 0.081–0.521)	0.15
Washing method (ref: By hand)
Stone sink/river rock	− 0.203 (− 0.624–0.217)	0.34
Wooden washboard	− 0.149 (− 0.568–0.269)	0.48
Interaction of collection time point and no. of people sleeping in the home (ref: 6 months: 0–4 people)
12 months: 5–9 people	1.347 (0.267–2.427)	0.01*
24 months: 5–9 people	1.011 (− 0.682–2.704)	0.24
36 months: 5–9 people	− 0.273 (− 1.184–0.637)	0.55
24 months: 10 + people	0.794 (− 1.033–2.662)	0.39
36 months: 10 + people	− 0.496 (− 1.553–0.561)	0.35

* p < 0.05;

^† R² = 0.460, F-statistic 8.172, p-value = 3.457 × 10–13