Table 2. Predictors of intensity of re-infection with Schistosoma haematobium (pooled analysis, n = 378).

Model 1 presents results from the univariable negative binomial model and Model 2 presents results from the final parsimonious multivariable negative binomial model. Homestead level piped water coverage was derived from a Gaussian kernel density estimation using data from a survey conducted in 2007.

	Model 1: univariable (n = 378)			Model 2: multivariable (n = 378)
Covariates	IRR	95%	P-value	IRR	95%	P-value
Female	0.17	0.06–0.54	0.003	0.14	0.06–0.32	<0.001
Community piped water coverage (continuous effect)	0.96	0.93–0.98	0.002	0.96	0.93–0.98	0.004
Age at baseline (years)	0.68	0.50–0.93	0.017	0.78	0.59–1.04	0.094
Altitude class (ref < 50)
50–100	3.65	0.91–14.5	0.067	1.20	0.31–4.56	0.793
100–150	0.72	0.21–2.54	0.612	0.41	0.1–1.74	0.226
≥150	0.11	0.02–0.62	0.012	0.05	0.01–0.32	0.001
Land cover class (ref. Sparse shrubland)
Closed shrubland	1.96	0.51–7.57	0.327	0.86	0.34–2.21	0.754
Open shrubland/grassland	1.77	0.33–9.49	0.508	1.41	0.48–4.16	0.533
Thickett	0.01	0.00–0.06	<0.001	0.02	0.00–0.20	0.001
Toilet in household (ref. no toilet)	2.71	0.70–10.4	0.148	0.77	0.24–2.46	0.662
Grade (ref. Grade 5)	0.24	0.08–0.75	0.014	1.35	0.52–3.48	0.540
Visit (ref. Follow up 1)	1.01	0.21–4.92	0.989	0.74	0.31–1.76	0.494
Distance to water body class (ref. < 1 km)
1–2 km	0.11	0.03–0.34	<0.001
2–3 km	0.18	0.04–0.85	0.031
>3 km	0.08	0.01–0.54	0.010
Household wealth index (ref. 1st quintile)
2	3.75	0.49–28.7	0.203
3	0.38	0.08–1.83	0.233
4	3.22	0.63–16.3	0.159
5	1.71	0.03–1.70	0.432
Square root of slope	0.77	0.45–1.32	0.340
Baseline intensity of infection (ref. Light infection)	2.59	0.81–8.30	0.110
Alpha (overdispersion parameter)				22.6	17.9–28.3	<0.001