Table 3. Effect of personal and environmental characteristics on the prevalence of rhinitis and rhinoconjunctivitis.

	No rhinitis, no rhinoconjunctivitis	Rhinitis	Rhinoconjunctivitis	P value*
Gender (No., M/F)	655/641	192/179	160/233	0.0014
Parental history for atopy (%)	13.8	17.0	24.4	< 0.0001
Mold/dampness (%)	12.8	15.6	19.6	0.003
Exposure to environmental tobacco smoke (%)	53.2	60.6	62.3	0.001
Reported exposure to truck traffic (%)	18.7	21.0	25.7	0.01

^*χ² test.