Table 5. Multiple logistic regression analysis of determinants for having conjunctivitis associated with rhinitis. Data are expressed as odds ratios (OR) and 95% confidence intervals (95% CI).

	OR	95% CI	P value
Female gender (ref. male)	1.42	1.14-1.79	0.002
Household crowding index (reference: <1)	1.27	0.99-1.56	0.054
Parental history for atopy (reference no history)	2.01	1.53-2.65	<0.0001
Heavy traffic (ref. "never/rare")	1.57	1.21-2.03	0.0006
Mold/dampness (reference no exposure)	1.56	1.17-2.10	0.003
Exposure to environmental tobacco smoke (ref. no exposure)	1.53	1.22-1.93	0.0003
Allergen sensitization*
Sensitization to seasonal allergens (ref. no sensitization)	0.95	0.4-1.96	0.90
Sensitization to perennial allergens (ref. no sensitization)	1.44	1.10-1.89	0.009
Sensitization to seasonal+perennial allergens (ref. no sensitization)	2.33	1.71-3.17	<0.0001

^*P for trend <0.0001.