Table 3.
Multivariate regression of laboratory-confirmed influenza versus demographic and clinical variables for subjects 6–49 years
| Variable | β estimate | OR (95% CI) | p value |
|---|---|---|---|
| Intercept term |
−5.85 |
|
<.001 |
| Age (years) |
−0.00 |
1.00 (0.98–1.02) |
.713 |
| Sex |
0.13 |
|
.606 |
| Female |
|
1.14 (0.70–1.84) |
|
| Malea |
|
1.0 |
|
| Acute onset |
1.18 |
|
<.001 |
| ≤3 days |
|
3.26 (2.09–5.10) |
|
| >3 daysa |
|
1.0 |
|
| Fever |
1.35 |
|
<.001 |
| >38.0°C |
|
3.84 (2.23–6.61) |
|
| ≤38.0°Ca |
|
1.0 |
|
| Cough |
3.87 |
|
<.001 |
| Yes |
|
47.99 (6.29–366.13) |
|
| Noa |
|
1.0 |
|
| Body aches |
0.95 |
|
.001 |
| Yes |
|
2.59 (1.47–4.54) |
|
| Noa |
|
1.0 |
|
| Vaccinated |
−1.10 |
|
.001 |
| Yes |
|
0.33 (0.18–0.62) |
|
| Noa | 1.0 |
NOTE. CI, confidence interval; OR, odds ratio. Multivariate stepwise logistic regression was performed in the combined age group (n = 521). The reduced model is presented here (n = 523). Age and sex were retained in the final model despite not being statistically associated with the outcome. aReference category in regression model.