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Table 3 Multivariate regression of laboratory-confirmed influenza versus demographic and clinical variables for subjects 6–49 years

From: Determination of clinical and demographic predictors of laboratory-confirmed influenza with subtype analysis

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  
  1. 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.