Table 1.
Subject characteristics in the Pneumocost Study
| Variables | Overall N = 524 |
Sample retained N = 269 |
Sample excluded N = 255 |
P-values for the two sample test of means and proportions |
|---|---|---|---|---|
| Sociodemographic | ||||
| Age | ||||
| Mean (SE) | 63.2 (17.1) | 62.0 (16.8) | 64.5 (17.3) | 0.101 |
| Range | 19–96 | 19–96 | 19–96 | |
| Median | 64 | 63 | 66 | |
| Woman | 45.0% | 49.0% | 40.78% | 0.056 |
| Employed | 33.2% | 32.7% | 33.7% | 0.805 |
| BMI | ||||
| Underweight | 10.8% | 9.2% | 12.5% | 0.231 |
| Normal weight | 50.7% | 49% | 52.5% | 0.426 |
| Overweight | 26.7% | 29% | 24.3% | 0.226 |
| Obesity | 11.6% | 12.6% | 10.5% | 0.464 |
| Smoker status | ||||
| Never smoker | 40.2% | 40.5% | 40.0% | 0.903 |
| Former smoker | 29.7% | 29.7% | 29.8% | 0.987 |
| Current smoker | 29.9% | 29.7% | 30.2% | 0.909 |
| Alcohol consumer | 31.0% | 35.3% | 26.2% | 0.025 |
| History of pneumonia | 20.0% | 20% | 20% | 0.983 |
| Health status | ||||
| Port Score | ||||
| 1 | 7.6% | 7.8% | 7.4% | 0.878 |
| 2 | 15.5% | 20.8% | 10.2% | 0.000 |
| 3 | 21% | 22.6% | 19.2% | 0.330 |
| 4 | 30.1% | 30.1% | 30.2% | 0.983 |
| 5 | 25.5% | 18.5% | 32.9% | 0.000 |
| Charlson | ||||
| 1 | 39.5% | 45.3% | 33.3% | 0.004 |
| 2 | 35.8% | 35.3% | 36.4% | 0.783 |
| 3 | 24.6% | 19.3% | 30.2% | 0.003 |
| Hospital stay | ||||
| Length of stay in days | ||||
| Mean (SE) | 15.3 (22.46) | 13.2 (10.2) | 17.5 (30.3) | 0.030 |
| Range | 1–378 | 1–87 | 1–378 | |
| Median | 10 | 10 | 10 | |
| Intensive care | 25.1% | 21% | 29% | 0.049 |
| Critical care | 41.6% | 22.3% | 23.9% | 0.660 |
| Emergency admission rate | 85% | 86.5% | 84.2% | 0.464 |
| Hospital mortality | n = 13 (2.48%) | – | ||
| Follow-up mortality | n = 30 (5.73%) | n = 13 (4.83%) | 17 (6.67%) | 0.366 |
Two-sample test of means and proportions (T-test or Pr test) were performed between the group retained (269) and the group excluded (255)