Table 2 Results from the random effects logistic regression model

Symptom severity

High

12.11

<0.001^a

[7.1, 20.7]

Medium

1.46

0.281

[0.84, 1.9]

Low*

0.06

Length of symptoms

>20 years

1.46

0.073^b

[0.96, 2.2]

5 years to 20 years

1.39

0.074^b

[0.96, 2.2]

<5 years*

0.47

History of allergic rhinitis

Both parents

1.44

0.089^b

[0.95, 2.2]

Mother only

1.20

0.37

[0.80, 1.8]

Neither parent*

0.58

Medication use

Intranasal corticosteroids

1.12

0.586

[0.75, 1.7]

Prescribed antihistamines

1.33

0.171

[0.89, 2.0]

OTC allergy medications*

0.67