Univariable analysis | Multivariable analysis | |||
---|---|---|---|---|
Parameter | OR | 95 % CI | OR | 95 % CI |
Non-respiratory season | 4.1 | 2.67–6.35** | 4.3 | 2.68–6.84** |
Age <60 years | 3.6 | 2.35–5.50** | 2.9 | 1.83–4.66** |
Male gender | 1.5 | 1.00–2.33 | 1.7 | 1.06–2.71* |
COPDa | 0.2 | 0.09–0.39** | 0.2 | 0.12–0.52** |
Smokingb | 1.6 | 1.01–2.64* | Excluded |