Allergen origin
Patients number
Patients No.
Percent
Odd ratio [95%CI]
P value
Indoor
580
Negative Positive
499 81
81.7 98.8
18.2 [2.5-132]
0.0000
Outdoor
443
436 7
71.4 87.8
2.9 [1.5-5.7]
0.001