Table 1.
Baseline characteristics and outcomes of patients hospitalized with acute lower respiratory tract illness stratified by case versus control status, July–December 2010 and 2011, (N = 1545)
| Case patients (n = 279) | Control patients (n = 1266) | P-value | |||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Male | 141 | 51 | 652/1265 | 52 | 0·8 |
| Median age (IQR) | 68 | (59–75) | 69 | (60–77) | 0·2 |
| Age group (years) | |||||
| 50–64 | 107 | 38 | 476 | 38 | 0·04 |
| 65–74 | 99 | 35 | 370 | 29 | |
| ≥75 | 73 | 26 | 420 | 33 | |
| Current smoker | 57/266 | 21 | 327/1202 | 27 | 0·05 |
| ≥1 underlying condition** | 92 | 33 | 417/1255 | 33 | 0·9 |
| Cardiovascular disease | 57 | 20 | 287 | 23 | 0·4 |
| Renal disease | 33 | 12 | 115 | 9 | 0·2 |
| Cancer | 7 | 3 | 27 | 2 | 0·7 |
| Cerebrovascular disease | 10 | 4 | 25 | 2 | 0·1 |
| Liver disease | 4 | 1 | 20 | 2 | 0·8 |
| Province | |||||
| Sa Kaeo | 103 | 37 | 610 | 48 | <0·01 |
| Nakhon Phanom | 176 | 63 | 656 | 52 | |
| Vaccinated against influenza* | 14 | 5 | 108 | 9 | 0·05 |
| Median length of hospitalization (IQR) | 4 | (4–6) | 5 | (4–8) | <0·01 |
| Respiratory failure requiring intubation | 9/256 | 4 | 110/1193 | 9 | <0·01 |
| Death | 6/255 | 2 | 45/1193 | 4 | 0·3 |
Denominators reflect number of patients for whom data were available when data were missing for some patients.
*
Vaccinated is defined as receipt of TIV ≥14 days and ≤182 days prior to hospitalization.
**
Participants were asked about the following medical conditions: liver, renal, cardiovascular and cerebrovascular disease and cancer.