Table 2. Logistic regression analysis of factors associated with Italians testing positive for Strongyloides stercoralis, study of S. stercoralis epidemiology, northern Italy, February 2013–July 2014 (n = 2,315 of which 1,137 cases and 1,178 controls).

Factors	OR	95% CI	P value
Eosinophil count ≥ 500/mcL	8.18	4.53–14.76	< 0.001
Sex (male vs female)	0.93	0.63–1.39	0.730
Year of birth
1947–1951	1.00	Reference	NA.
1937–1946	2.56	1.24–5.28	0.011
1936 or before	3.95	1.90–8.20	< 0.001
Recruitment site
Trieste	1.00	Reference	NA
Udine	1.34	0.54–3.32	0.52
Negrar	1.67	0.69–4.00	0.25
Mantova	2.33	1.00–5.41	0.050
Brescia	2.47	1.07–5.70	0.033
Treviso	2.97	1.33–6.64	0.008
San Bonifacio	3.43	1.54–7.68	0.003

CI: confidence interval; NA: not applicable; OR: odds ratio.