Table 1.
Comparison of patients with versus without pneumonia
| Variate* | All patients (n = 621) |
Patients without pneumonia (n = 494) |
Patients with pneumonia (n = 127) |
|---|---|---|---|
| Age | 46.7 (SD 16.3) | 46.6 (SD 16.1) | 46.8 (SD 17.2) |
| Gender (male) | 308 (50%) | 247 (50%) | 61 (48%) |
| New onset/worsened cough's duration (days) | 7.0 (SD 9.6) | 6.7 (SD 6.4) | 8.4 (SD 17) |
| Chronic cough | 43 (7%) | 30 (6%) | 13 (10%) |
| Daily fever | 350 (56%) | 266 (54%) | 84 (66%) |
| Maximum temperature (°C) | 38.5 (SD 1.0) | 38.4 (SD 1.0) | 38.8 (SD 1.0) |
| Dyspnea | 223 (36%) | 165 (33%) | 58 (46%) |
| Dyspnea at effort only | 117 (19%) | 88 (18%) | 29 (23%) |
| Wheezing | 109 (18%) | 85 (17%) | 24 (19%) |
| Pain on inspiration | 179 (29%) | 133 (27%) | 46 (36%) |
| Rigors | 205 (23%) | 150 (30%) | 55 (43%) |
| Muco-purulent sputum | 302 (49%) | 240 (49%) | 62 (49%) |
| Bloody sputum | 42 (7%) | 27 (5%) | 15 (12%) |
| Cold/Influenza signs | 301 (48%) | 252 (51%) | 49 (39%) |
| Non-Smoker | 440 (71%) | 349 (71%) | 91 (72%) |
| Smoking (cigs./day) | 16.4 (SD 9.1) | 16.1 (SD 9.3) | 17.6 (SD 8.7) |
| Pack years | 12.7 (SD 18.2) | 8.7 (SD 12.2) | 25 (SD 26.7) |
| History of pneumonia | 20 (3%) | 17 (3%) | 3 (2%) |
| Current temperature (°C) | 37.4 (SD 1.0) | 37.3 (SD 1.0) | 37.7 (SD 1.0) |
| Signs of upper respiratory infection | 234 (38%) | 201 (46%) | 33 (26%) |
| Respiratory rate (#/minute) | 17 (SD 6) | 16.6 (SD 5.7) | 18.6 (SD 5.9) |
| Prolonged expiration | 64 (10%) | 48 (10%) | 16 (13%) |
| Percussion: dullness (a) | 38 (6%) | 13 (3%) | 25 (20%) |
| Auscultation: friction rub (b) | 18 (3%) | 7 (1%) | 11 (9%) |
| Auscultation: diminished inspiratory sound (c) | 74 (12%) | 43 (9%) | 31 (24%) |
| Auscultation: bronchial breath sound (d) | 52 (8%) | 28 (6%) | 24 (19%) |
| Auscultation: rales and/or wheezing (e) | 192 (31%) | 144 (29%) | 48 (38%) |
| Abnormalities in a to e, if 2+ in single locus | 140 (23%) | 84 (17%) | 56 (44%) |
| Abnormalities in a to e, if 2+ in different loci | 18 (3%) | 10 (2%) | 8 (6%) |
| C-reactive protein (CRP) | |||
| CRP 0 to 10 | 108 (17%) | 108 (22%) | 0 (0%) |
| CRP 11 to 50 | 265 (43%) | 240 (49%) | 25 (20%) |
| CRP 51 to 100 | 106 (17%) | 78 (16%) | 28 (22%) |
| CRP >100 | 134 (22%) | 61 (12%) | 73 (57%) |
*Means and standard deviation; number of patients and percentages