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Table 3

Associations of a strong serological response (≥20% of PC) with study site, age group, gender and commuting (2004–2005)

	15/17-kDa			27-kDa
	Adjusted prevalence ratio^a	95% CI	p-value	Adjusted prevalence ratio^a	95% CI	p-value
Site			0.006			0.095
D (BF)	1.00			1.00
F (BF)	1.55	1.10–2.17	0.012	1.14	0.92–1.40	0.222
E (GW)	1.23	0.87–1.74	0.244	1.23	1.03–1.48	0.023
C (GW)	1.32	0.93–1.88	0.122	1.26	1.05–1.51	0.014
B (SW)	1.61	1.17–2.21	0.003	1.28	1.07–1.53	0.008
A (SW)	1.68	1.23–2.30	0.001	1.28	1.06–1.54	0.010
Age group			0.001			0.018
18–29	1.00			1.00
30–39	1.25	1.01–1.54	0.037	1.11	1.00–1.24	0.053
40–57	1.43	1.18–1.74	<0.001	1.16	1.05–1.28	0.005
Gender			0.468			0.807
Male	1.00			1.00
Female	1.06	0.91–1.24	0.468	1.01	0.93–1.10	0.807
Commuting			0.321			0.975
No	1.00
Yes	0.91	0.76–1.10	0.321	1.00	0.91–1.10	0.975

	15/17-kDa			27-kDa
	Adjusted prevalence ratio^a	95% CI	p-value	Adjusted prevalence ratio^a	95% CI	p-value
Site			0.006			0.095
D (BF)	1.00			1.00
F (BF)	1.55	1.10–2.17	0.012	1.14	0.92–1.40	0.222
E (GW)	1.23	0.87–1.74	0.244	1.23	1.03–1.48	0.023
C (GW)	1.32	0.93–1.88	0.122	1.26	1.05–1.51	0.014
B (SW)	1.61	1.17–2.21	0.003	1.28	1.07–1.53	0.008
A (SW)	1.68	1.23–2.30	0.001	1.28	1.06–1.54	0.010
Age group			0.001			0.018
18–29	1.00			1.00
30–39	1.25	1.01–1.54	0.037	1.11	1.00–1.24	0.053
40–57	1.43	1.18–1.74	<0.001	1.16	1.05–1.28	0.005
Gender			0.468			0.807
Male	1.00			1.00
Female	1.06	0.91–1.24	0.468	1.01	0.93–1.10	0.807
Commuting			0.321			0.975
No	1.00
Yes	0.91	0.76–1.10	0.321	1.00	0.91–1.10	0.975

PC, positive control; SW, surface water; GW, groundwater; BF, river-bank infiltration; 95% CI, 95% confidence interval.

^aPrevalence ratio for a particular factor is adjusted for all other factors included in the table.