Table 1.
A Comparison of Participant Characteristics by Study Group
| Characteristic | CAP (n = 183) | Controls (n = 450) | NPLRTI (n = 201) | P Valuea |
|---|---|---|---|---|
| Male sex | 105 (57) | 207 (46) | 92 (46) | .024 |
| Age, y | ||||
| Mean ± SD | 59.5 ± 20.6 | 62.2 ± 15.6 | 66.3 ± 18.5 | < .01 |
| Range | 19–96 | 19–93 | 19–99 | … |
| > 65 | 94 (51) | 238 (53) | 130 (65) | .01 |
| Smoking status | ||||
| Former smoker | 28 (15) | 64 (14) | 31 (15) | .897 |
| Current smoker | 40 (22) | 61 (14) | 30 (15) | .03 |
| Former and/or current smoker | 68 (37) | 125 (28) | 61 (30) | .067 |
| Vaccination status | ||||
| Prior influenza vaccination | 58 (32) | 164 (36) | 73 (36) | .499 |
| Prior pneumoccocal vaccination | 14 (8) | 80 (18) | 23 (11) | < .01 |
Data are presented as No. (%), unless otherwise indicated. CAP = community-acquired pneumonia; NPLRTI = nonpneumonic lower respiratory tract infection.
a
Three-group comparison.