Table 1 Baseline characteristics of the participants in the case-control study on acute respiratory tract infections in the general practice network, 2000–2003
Characteristics | Case patients (n = 493) | Control subjects (n = 493) |
|---|---|---|
Sex (%) | Â | Â |
   Male | 46 | 37 |
   Female | 54 | 63 |
Age, mean (years) [P25–P75] | 36 [22–49] | 37 [22–52] |
Received influenza vaccination for the season (%) | Â | Â |
   yes | 16 | 14 |
   No | 84 | 86 |