Clinical Decision Rules Based on Multivariate Models from Combined Dataset (Flu Scores 1 to 3) and Multivariate Model of Monto et al13 (Flu Scores 4 and 5)
| Clinical Variable | Beta | Odds ratio (95% CI) | Points |
|---|---|---|---|
| Flu score 1 | |||
| Fever | 1.225 | 3.40 (1.97–5.89) | 7 |
| Cough | 0.912 | 2.49 (0.95–6.49) | 5 |
| Onset <48 hours | 0.727 | 2.07 (1.17–3.65) | 4 |
| Myalgias | 1.386 | 4.00 (1.91–8.39) | 8 |
| Constant | −3.423 | ||
| Flu score 2 | |||
| Fever | 0.763 | 2.14 (1.13–4.06) | 2 |
| Myalgia | 1.304 | 3.68 (1.72–7.90) | 4 |
| Chills/sweats | 0.430 | 1.54 (0.79–2.97) | 2 |
| Fever, cough, acute | 1.443 | 4.23 (1.95–9.19) | 4 |
| Constant | −2.686 | ||
| Flu score 3 | |||
| Onset <48 hours | 0.721 | 2.06 (1.19–3.55) | 1 |
| Myalgia | 1.260 | 3.53 (1.65–7.53) | 2 |
| Chills/sweats | 0.401 | 1.49 (0.78–2.87) | 1 |
| Fever and cough | 1.361 | 3.90 (2.27–6.70) | 2 |
| Constant | −2.808 | ||
| Flu score 4 | |||
| Fever (temp ≥37.8°C) | 1.182 | 3.26 | 3.0 |
| Cough | 1.047 | 2.85 | 3.0 |
| Nasal congestion | 0.683 | 1.98 | 2.0 |
| Age ≥55 years | 0.470 | 1.60 | 1.5 |
| Weakness | 0.432 | 1.54 | 1.5 |
| Onset <48 hours | 0.425 | 1.53 | 1.5 |
| Male | 0.239 | 1.27 | 1.0 |
| Sore throat | −0.329 | 0.72 | −1.0 |
| Flu score 5 | |||
| Fever | 1.182 | 3.26 | 3 |
| Cough | 1.047 | 2.85 | 3 |
| Nasal congestion | 0.683 | 1.98 | 2 |
| Age ≥55 years | 0.470 | 1.60 | 1 |
| Weakness | 0.432 | 1.54 | 1 |
| Onset <48 hours | 0.425 | 1.53 | 1 |
| Male sex | 0.239 | 1.27 | 1 |
| Sore throat | −0.329 | 0.72 | −1 |