TABLE 4.

Final multivariable model for indigenous giardiasis, based on data for 69 cases and 172 controls without history of foreign travel^a

Variables included	Adjusted OR (95% CI)b	P
Swimming in swimming pool	2.67 (1.14–6.25)	0.023
Changing diapers
No children or children not in diapers	Reference	0.051
Children in diapers but not changing diapers	1.14 (0.22–6.07)	0.874
Changing diapers	3.38 (1.25–9.16)	0.016
Reporting irritable bowel syndrome	3.66 (1.18–11.37)	0.025
Drinking unboiled water straight from tap	8.17 (1.45–46.03)	0.017
Weekly frequency of raw fruit consumption (per event)	0.77 (0.68–0.87)	<0.001
Practicing field sports	0.21 (0.05–0.89)	0.035
Visiting animal premises other than farm, wildlife park, or zoo (e.g., friends' or relatives' houses)	0.10 (0.01–0.89)	0.040
Male	1.90 (0.98–3.69)	0.057
Age		0.813
0–4 yr	Reference
5–14 yr	0.60 (0.08–4.23)
15–44 yr	0.84 (0.21–3.37)
45–64 yr	0.5 (0.13–2.33)
≥65 yr	0.60 (0.13–2.82)

^aThe numbers of cases and controls refer to those with complete variable data (e.g., without missing data for any of the variables retained in the model). Model statistics were as follows: model χ²₁₃ = 55.18, P < 0.001; Nagelkerke R² = 0.293; Hosmer-Lemeshow χ²₈ = 5.66, P = 0.686.

^bOR, odds ratio; CI, confidence interval.