Table 3.
Logistic regression results with prescriptions of anti-asthma medication as outcome
| Reference (OR = 1) | Unadjusted | Model 1 | Model 2 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| OR | 95% CI | p | OR | 95% CI | p | OR | 95% CI | p | ||
| Female gender | Male | 1.79 | 1.22–2.41 | < 0.001 | 2.00 | 1.45–2.75 | < 0.001 | 2.15 | 1.51–3.05 | < 0.001 |
| Age | Continuous | 0.98 | 0.91–1.05 | 0.551 | 0.98 | 0.91–1.05 | 0.547 | 0.96 | 0.89–1.05 | 0.370 |
| Education | Continuous | 0.98 | 0.92–1.05 | 0.615 | 0.97 | 0.90–1.05 | 0.442 | |||
| Body mass index | Continuous | 1.01 | 0.98–1.05 | 0.423 | 1.04 | 1.00–1.08 | 0.050 | |||
| Asthma at T1 | No asthma | 2.60 | 1.67–4.05 | < 0.001 | 2.48 | 1.52–4.03 | < 0.001 | 2.49 | 1.50–4.13 | < 0.001 |
| Allergies at T1 | No allergies | 1.58 | 1.15–2.17 | 0.005 | 1.38 | 0.98–1.95 | 0.067 | 1.51 | 1.05–2.17 | 0.025 |
| Smoking at T4 | Never smoked | |||||||||
| Smoked daily before, but not now | 1.47 | 0.99–2.18 | 0.054 | 1.15 | 0.73–1.83 | 0.540 | ||||
| Smokes sometimes, but not daily | 1.01 | 0.61–1.66 | 0.976 | 0.88 | 0.51–1.56 | 0.678 | ||||
| Smokes daily | 1.73 | 1.23–2.42 | 0.002 | 1.20 | 0.78–1.85 | 0.414 | ||||
| Cannabis use at T4 | Never used cannabis | |||||||||
| Used cannabis before, but not last year | 0.83 | 0.57–1.22 | 0.342 | 0.85 | 0.57–1.27 | 0.423 | 0.82 | 0.53–1.28 | 0.378 | |
| Used cannabis last year | 1.65 | 1.14–2.41 | 0.009 | 2.05 | 1.38–3.05 | < 0.001 | 1.71 | 1.06–2.77 | 0.028 | |
Note: OR = odds ratio; 95% CI = 95% confidence interval of OR
Data on prescriptions are taken from the Norwegian Prescription Database and and explanatory variables are taken from the longitudinal Young in Norway Study. Model 1 includes adjustment for gender, age, self-reported asthma or allergies in addition to cannabis smoking. Model 2 includes additional adjustment for education, BMI and smoking