Table 3. Results of multivariable analyses: factors associated with IgG seropositivity for West Nile virus.

Exposure variable		Adjusted Prevalence Ratio (95% CI)*	P-value
Analysis of full dataset (n=614)
Area of residence†	Urban	Reference
	Rural/semi-urban	8.18 (1.14–58.72)	0.037
Employment status	Employed	Reference
	Retired	2.60 (1.38–4·90)	0.003
	Housekeeper	4.30 (2·18–8.46)	<0.001
Water repositories on property	No	Reference
	Yes	2.67 (1.43–5.00)	0.002
Main profession	Other	Reference
	Agricultural labour	2.93 (1.34–6.40)	0.007
Subanalysis from rural/semi-urban‡areas only (n=442)
Irrigation drainage ditch within 500 m radius	No	Reference
	Yes - ditch <1km in length	6.84 (0.74–63.13)	0.090
	Yes - ditch >1km in length	8.62 (1.02–73.18)	0.048
Employment status	Employed	Reference
	Retired	3.20 (1.78–5.76)	<0.001
	Housekeeper	2.38 (1.04–5.44)	0.040
Water repositories on property	No	Reference
	Yes	2.66 (1.26–5.64)	0.011

95% CI: 95% confidence interval

^*Adjusted prevalence ratios and confidence intervals are weighted by age and urban/rural area of residence, and adjusted for cluster design.

^†Area of residence: urban: >20,000 inhabitants; semi-urban: 2,000–20,000 inhabitants; rural: <2,000 inhabitants.