Table 4. Description of case-patients with available risk factor data identified during active case-finding in 2009 and during three consecutive health utilization surveys in 2010, three cities in Argentina.
| Characteristica | Decedents with a history of influenza and respiratory samples positive for influenza A(H1N1)pdm09. N = 49 | SARI case-patients with respiratory samples positive for influenza A(H1N1)pdm09. N = 278 | Health-care seeking ILI case-patients with respiratory samples positive for influenza A(H1N1)pdm09 with available information. N = 209 | General population in the sentinel sites surveyed with available data (95% confidence interval). N = 752 ILI case-patients |
| Median age (interquartile range)b | 37 (19–57) | 30 (16–51) | 19 (10–34 | 20 (7–40) |
| Females, n/N (%)c | 22/49 (45%) | 136/231(41%) | 104/212 (49%) | 409/748 (51.1–58.3%) |
| Pregnancy among women aged 15–50 years, n/N (%)d | 1/6 (17%) | 34/66 (51%) | 3/33 (9%) | 9/164 (2–9%) |
| Obesity, n/(%)d | 9/17 (53%) | 12/92 (13%) | 0/29 (0%) | 13/738 (0.8–2%) |
| Diabetes n/N (%)d | 2/29 (7%) | 9/167 (5%) | 2/114 (2%) | 22/740 (1.7–4.2%) |
| Chronic obstructive pulmonary disease n/N (%)d | 1/29 (3%) | 2/167 (1%) | 0/114 (0%) | 47/742 (4.6–8.1) |
| Asthma n/N (%)d | 1/15 (6%) | 5/90 (5%) | 2/32 (6%) | 50/740 (4.9–8.6) |
2009 H1N1 denotes influenza A (H1N1)pdm09, SARI denotes severe acute respiratory illness, and ILI denotes influenza-like illness.
a
among cases with available age, pregnancy, obesity, chronic obstructive pulmonary disease, or asthma status data.
b
The age of case-patients is significantly associated with decedent, SARI, or ILI case-status in linear regression (p≤0.001).
c
The sex of case-patients is significantly associated with decedent, SARI, or ILI case-status in Fisher Exact testing (p = 0.01).
d
The characteristic is significantly associated with decedent, SARI, or ILI case-status in Fisher Exact testing (p<0.001).