Table 2.

Presence of antibodies against Phlebotomus perniciosus saliva: odds-ratios, 95% confidence intervals and significances, obtained by simple (OR crude) and multiple (OR adjusted) logistic regression models

Variable/categories	OR crude	95% CI	P-value	OR adjusted	95% CI	P-value
Sexb
Femalea
Male	1.41	0.92–2.15	0.112 (${\chi }_{\text{Wald}}^2$ = 2.528, df = 1)
Age group
2–11 monthsa			<0.001 (${\chi }_{\text{Wald}}^2$ = 35.190, df = 3)			<0.001 (${\chi }_{\text{Wald}}^2$ = 29.553, df = 3)
12–35 months	2.01	0.95–4.24	0.067 (${\chi }_{\text{Wald}}^2$ = 3.360, df = 1)	3.56	1.39–9.16	0.008 (${\chi }_{\text{Wald}}^2$ = 6.953, df = 1)
36–95 months	2.86	1.42–5.78	0.003 (${\chi }_{\text{Wald}}^2$ = 8.608, df = 1)	9.43	3.62–24.48	<0.001 (${\chi }_{\text{Wald}}^2$ = 21.224, df = 1)
More than 95 months	8.05	3.91–16.56	<0.001 (${\chi }_{\text{Wald}}^2$ = 32.070, df = 1)	9.68	3.92–23.91	<0.001 (${\chi }_{\text{Wald}}^2$ = 24.222, df = 1)
Reproductive statusb
Entirea
Neutered	5.38	3.28–8.82	<0.001 (${\chi }_{\text{Wald}}^2$ = 44.393, df = 1)
Breedb
Defineda
Mongrel	0.89	0.35–2.30	0.811 (${\chi }_{\text{Wald}}^2$ = 0.057, df = 1)
Fur lengthb
Shorta
Medium or long	2.40	1.19–4.84	0.015 (${\chi }_{\text{Wald}}^2$ = 5.953, df = 1)
Lifestyleb
Domestica
Shelter/stray	0.28	0.180–0.44	<0.001 (${\chi }_{\text{Wald}}^2$ = 30.684, df = 1)
Regionb
Centrea			0.001 (${\chi }_{\text{Wald}}^2$ = 13.693, df = 2)
Lisbon metropolitan area	0.36	0.20–0.64	0.001 (${\chi }_{\text{Wald}}^2$ = 11.957, df = 1)
Algarve	0.76	0.28–2.05	0.586 (${\chi }_{\text{Wald}}^2$ = 0.297, df = 1)
Other animalsb
Noa
Yes	0.61	0.31–1.20	0.152 (${\chi }_{\text{Wald}}^2$ = 2.053, df = 1)
Ectoparasiticidesb
Noa
Yes	3.44	1.98–5.96	<0.001 (${\chi }_{\text{Wald}}^2$ = 19.290, df = 1)
Clinical signsb
Noa
Yes	1.43	0.89–2.28	0.138 (${\chi }_{\text{Wald}}^2$ = 2.203, df = 1)
Concomitant diseasesb
Noa
Yes	1.53	0.82–2.88	0.186 (${\chi }_{\text{Wald}}^2$ = 1.751, df = 1)
Phlebotomine activity periodb
Noa
Yes	11.42	6.90–18.90	<0.001 (${\chi }_{\text{Wald}}^2$ = 89.858, df = 1)	19.44	9.84–38.41	<0.001 (${\chi }_{\text{Wald}}^2$ = 72.947, df = 1)

^aReference category

^bVariable that did not have a statistically significant association in the fitted model

Abbreviations: OR, odds ratio; CI, confidence interval