Table 4.
Comparison of Prevalence of Pregnancy and Obesity between Case Patients with Nonsevere and Severe 2009 Pandemic Influenza A (H1N1) Illness and the General Chinese Population
| Variable | No. (%) of patients (or persons) with obesity or pregnancy |
Odds ratios (95% confidence interval), P |
|||
| Severe illness | Nonsevere illness | General population | Severe illness vs Nonsevere illness | Nonsevere illness vs general population | |
| Pregnancya | 562 (51) | 450 (31) | 11,607,818 (3) | 2.39 (2.03–2.81), <.001 | 13.20 (11.82–14.75), <.001 |
| Obesityb | 559 (19) | 777 (14) | 88,303,356 (7) | 1.36 (1.21–1.53), <.001 | 2.26 (2.09–2.44), <.001 |
| 2–17 years of age | 198 (24) | 498 (18) | 5,714,358 (2) | 1.40 (1.17–1.69), <.001 | 10.45 (9.49–11.52), <.001 |
| 18–59 years of age | 335 (19) | 251 (11) | 66,542,622 (8) | 1.99 (1.66–2.37), <.001 | 1.35 (1.18–1.54), <.001 |
| ≥60 years of age | 26 (6) | 28 (9) | 16,046,376 (9) | 0.66 (.38–1.15), .142 | 1.02 (.69–1.51), .906 |
a
Prevalence of pregnancy was expressed as the percentage of pregnant women among women of reproductive age (15–49 years of age).
b
Children <2 years of age and pregnant women were excluded.