Table 1.
Demographic and clinical characteristics of children 5 y old or younger with ILI
| All (n = 1486) | Outpatient or ED < 24 h (n = 408) | Hospitalized (n = 1078) | χ 2 P‐valuea | |
|---|---|---|---|---|
| Sex | ||||
| Male | 829 (55.8%) | 225 (55.1%) | 604 (56%) | 0.80 |
| Female | 657 (44.2%) | 183 (44.9%) | 474 (44%) | |
| Age | ||||
| <1 y old | 537 (36.1%) | 82 (20.1%) | 455 (42.2%) | <0.001 |
| 1‐2 y old | 400 (26.9%) | 109 (26.7%) | 291 (27%) | |
| 3‐5 y old | 549 (36.9%) | 217 (53.2%) | 332 (30.8%) | |
| Days from symptom onsetb | ||||
| 0‐1 d ago | 585 (39.4%) | 248 (60.8%) | 337 (31.3%) | <0.001 |
| 2‐3 d ago | 389 (26.2%) | 77 (18.9%) | 312 (28.9%) | |
| 4 or more days ago | 509 (34.3%) | 83 (20.3%) | 426 (39.5%) | |
| Missing | 3 (0.2%) | 0 (0%) | 3 (0.3%) | |
| Current tobacco smoke exposure | ||||
| No | 1193 (80.3%) | 328 (80.4%) | 865 (80.2%) | 0.99 |
| Yes | 293 (19.7%) | 80 (19.6%) | 213 (19.8%) | |
| Any comorbidity | ||||
| No | 882 (59.4%) | 322 (78.9%) | 560 (51.9%) | <0.001 |
| Yes | 604 (40.6%) | 86 (21.1%) | 518 (48.1%) | |
| Viral infection | ||||
| No (0 viruses detected) | 259 (17.4%) | 82 (20.1%) | 177 (16.4%) | 0.11 |
| Yes (1 or more viruses detected) | 1227 (82.6%) | 326 (79.9%) | 901 (83.6%) | |
| Number of viral infections | ||||
| 0 | 259 (17.4%) | 82 (20.1%) | 177 (16.4%) | 0.04 |
| 1 | 972 (65.4%) | 246 (60.3%) | 726 (67.3%) | |
| 2 or more | 255 (17.2%) | 80 (19.6%) | 175 (16.2%) | |
Chi‐square P‐values reflect tests that have omitted “missing” as a category. For any comparison with a cell with n < 5, a Fisher's Exact P‐value was reported.
Days between symptom onset and enrollment into the study (hospital admission).