1) Atypical vs. other (viral cases excluded) | 2) Atypical vs. other and unknown | 3) Atypical and unknown vs. other | ||||
---|---|---|---|---|---|---|
Parameter | OR | 95 % CI | OR | 95 % CI | OR | 95 % CI |
Non-respiratory season | 4.2 | 2.58–6.72** | 3.0 | 1.95–4.47** | 2.0 | 1.47–2.76** |
Age <60 years | 2.7 | 1.69–4.36** | 3.0 | 1.97–4.59** | 1.0 | 0.75–1.35 |
Male gender | 1.7 | 1.09–2.81* | 1.6 | 1.02–2.41* | 1.2 | 0.91–1.56 |
COPDa | 0.2 | 0.11–0.48** | 0.3 | 0.15–0.65* | 0.5 | 0.37–0.70** |