Table 5. Risk factors associated with T. trichiura, Strongyloides spp., and undifferentiated STH infection.

	T. trichiura (n = 172)			Strongyloides spp. (n = 49)			Any STH (n = 519)
Risk factor variables	aOR	95% CI	P value	aOR	95% CI	P value	aOR	95% CI	P value
Male sexa	1.12	0.68–1.85	0.643	1.86	0.86 0 4.03	0.098	1.49	1.03–2.17	0.033
Age group 6–11 yearsb	3.00	1.49–6.01	0.002	2.57	0.68–9.69	0.162	4.04	2.39–6.83	<0.001
Age group 12–17 yearsb	5.99	2.56–14.00	<0.001	10.11	2.58–36.60	0.001	6.82	3.24–14.34	<0.001
Age group 18–34 yearsb	1.31	0.56–3.09	0.530	5.08	1.17–22.05	0.030	4.73	2.47–9.08	<0.001
Age group 35–49 yearsb	0.98	0.43–2.23	0.960	4.00	0.95–16.90	0.059	5.31	2.77–10.15	<0.001
Age group ≥50 yearsb	0.84	0.31–2.26	0.729	4.00	0.87–18.31	0.074	3.60	2.01–6.44	<0.001
N. americanus co-infection	3.39	1.66–6.91	<0.001	4.42	1.32–14.75	0.013	-	-	-
A. ceylanicum co-infection	-	-	-	-	-	-	-	-	-
T. trichiura co-infection	-	-	-	3.00	1.18–7.62	0.026	-	-	-
Strongyloides spp. co-infection	-	-	-	-	-	-	-	-	-
Wears shoes outside c
Sometimes	0.86	0.41–1.79	0.686	-	-	-	-	-	-
Always	0.19	0.05–0.71	0.013	-	-	-	-	-	-
Has toilet/latrine in household	-	-	-	-	-	-	0.40	0.24–0.68	0.001
Annual precipitation (cm)	1.14	1.04–1.25	0.008	-	-	-	-	-	-
Soil pH (pH >5.30–5.50)d	-	-	-	7.47	1.90–29.33	0.004	3.91	1.71–8.97	0.001

“95% CI” denotes 95% confidence interval, “aOR” denotes adjusted odds ratio. These results were derived from a model building procedure where variables were removed from the analysis if they did not meet the criterion p value at each stage of the analysis. Variables with blank cells indicate that these were removed in an earlier stage. Tables F-K in S1 Text summarises the p values associated with each variable at each stage of the model building procedure.

Reference categories:

^aFemale sex;

^bAge group 1–5 years;

^cNever wears shoes outside;

^dSoil pH 5.20–5.30.

Sex and age group were entered as covariates in the model.