Table 2.
Characteristics of patients with IFI positive and IFI negative (November 2008–2009; n = 410)*
| Characteristics | IFI positive (n = 37) | IFI negative (n = 373) | P value |
|---|---|---|---|
| Age, year | 50·4 ± 19·5 | 51·4 ± 18·4 | 0·741 |
| Male sex | 16 (43·2) | 148 (39·7) | 0·673 |
| White race | 29 (78·4) | 269 (72·1) | 0·415 |
| Years of schooling | 8 (5–11) | 7 (4–10) | 0·139 |
| Current smokers | 7 (31·8) | 78 (37·1) | 0·622 |
| Presence of smokers at home | 12 (32·4) | 141 (37·8) | 0·520 |
| Air conditioning at home or at work | 13 (35·1) | 68 (18·2) | 0·014 |
| Use of wood stoves | 6 (16·2) | 51 (13·7) | 0·670 |
| Mold in home | 15 (40·5) | 118 (31·6) | 0·270 |
| Cough | 36 (97·3) | 315 (84·5) | 0·034 |
| Fever | 24 (64·9) | 190 (50·9) | 0·106 |
| Dyspnea | 32 (86·5) | 314 (84·2) | 0·713 |
| Chest pain | 28 (75·7) | 233 (62·5) | 0·111 |
| Coryza | 20 (5·1) | 171 (46·0) | 0·347 |
| Sore throat | 8 (21·6) | 94 (25·2) | 0·631 |
| Wheezing | 27 (73·0) | 199 (53·4) | 0·022 |
| Duration of symptoms before admission | 2 (2–4) | 3 (2–4) | 0·613 |
| ILI | 10 (27·0) | 43 (11·5) | 0·007 |
| SARI | 23 (62·2) | 143 (38·3) | 0·005 |
| Need for hospitalization | 9 (24·3) | 96 (25·8) | 0·931 |
| Length of hospital stay, days | 4 (2–5) | 6 (3–15·8) | 0·033 |
| Mortality rate | 1 (2·7) | 5 (1·3) | 0·342 |
ILI, influenza-like illness; SARI, severe acute respiratory infection.
*
Data are presented as mean ± SD, n/N (%): number of cases with characteristic/total number of cases (percentage) or median (interquartile range).