Table 3. Potential predictors of the probability of detection at the border of international travel–related pandemic influenza A (H1N1) 2009 infection, People’s Republic of China, 2009*.
| Model | OR (95% CrI) | p value |
|---|---|---|
| Univariable | ||
| Fever on arrival | 1.84 (1.04–3.27) | 0.042 |
| Onset of symptoms >1 d before arrival | 1.05 (0.91–1.22) | 0.288 |
| Age group, y† | 0.126 | |
| 0–4 | 1 | |
| 5–24 | 1.67 (0.55–5.03) | |
| 25–49 | 1.12 (0.36–3.50) | |
| 50–64 | 0.58 (0.13–2.69) | |
| Province‡ | 0.400 | |
| 44 | 1 | |
| 31 | 1.05 (0.49–2.23) | |
| 35 | 0.66 (0.30–1.45) | |
| Multivariable§ | ||
| Fever on arrival | 1.80 (1.26–2.57) | 0.001 |
| Onset of symptoms >1 d before arrival | 2.36 (1.18–4.73) | 0.016 |
| Interaction between fever on arrival and onset of symptoms >1 d before arrival | 0.45 (0.22–0.89) | 0.023 |
*OR, odds ratio; CrI, credible interval. †n = 463. Only 1 such person was >64 y of age, and this person was excluded from this analysis. ‡n = 302. Only 3 provinces had >40 persons so only they are included here. §Likelihood ratio–based p value for the global hypothesis that all ORs equal 1 (3 df 0.008). The deviance (that is minus twice the log likelihood) for the multivariable model presented was 520.6, whereas the deviance for the model with only an intercept (i.e., no effects of fever or time from onset to arrival) was 532.5.