Skip to main content

Table 2 Analysis of confounding factors related to medication use by ordered logistic regression with pollen and the period and one confounding factor at a time.

From: Difference in symptom severity between early and late grass pollen season in patients with seasonal allergic rhinitis

Confounding Factor

Factors of analysis

2007

 

2008

 
  

Proportional

Odds Ratio (95%CI)

P-value

Proportional

Odds Ratio (95%CI)

P-value

-

Perioda

0.40 (0.32-0.50)

< 0.001

0.49 (0.40-0.61)

< 0.001

Medication

Period

0.42 (0.33-0.53)

< 0.001

0.48 (0.39-0.60)

< 0.001

 

Medication useb

2.77 (1.74-4.43)

< 0.001

3.57 (2.47-5.17)

< 0.001

Nasal steroid

Perioda

0.40 (0.31-0.51)

< 0.001

0.48 (0.38-0.59)

< 0.001

 

Nasal steroidc

1.51 (0.76-2.97)

0.24

2.43 (1.26-4.70)

0.008

  1. The proportional odds ratio, the 95% confidence interval (CI) and the p values for the period and the confounding factor for each model are shown for 2007 and 2008.
  2. a The period refers to the late (index) versus the early season (reference) of the grass pollen season.
  3. bMedication use refers to the daily use of any medication for hay fever symptoms (index) versus no use of medication (reference).
  4. cNasal steroid refers to the daily use of nasal steroid spray (index) versus no use of nasal steroid spray (reference).