Baseline characteristics and comorbidities
| Variable | Patients with CAP≥65 years (n=2569) | Patients with NHAP≥65 years (n=518) | p Value |
| Age, years (median (IQR) (n)) | 76.1 (10.8) (2569) | 83.3 (12.0) (518) | <0.001 |
| Men, n (%) | 1609 (62.6) | 221 (42.7) | <0.001 |
| Weight, kg (median (IQR) (n)) | 74 (20) (2488) | 65 (19) (423) | <0.001 |
| Height, cm (median (IQR) (n)) | 170 (13) (2483) | 167 (12) (426) | <0.001 |
| BMI, kg/m2 (median (IQR) (n)) | 25.2 (5.7) (2480) | 23.0 (5.0) (420) | <0.001 |
| Obesity (BMI≥30), n (%) | 433 (17.5) | 31 (7.4) | <0.001 |
| Smoker, n (%) | 453 (18.3) | 40 (8.9) | <0.001 |
| Pack-years (median (IQR) (n)) | 30 (35) (1095) | 30 (28) (78) | 0.285 |
| Long-term oxygen therapy, n (%) | 209 (8.2) | 16 (3.1) | <0.001 |
| Pneumococcal vaccination in the past 5 years, n (%) | 389 (17.1) | 27 (9.3) | <0.001 |
| Comorbidity, n (%) | 2275 (90.2) | 376 (97.1) | <0.001 |
| Chronic respiratory disease | 1197 (46.8) | 153 (30.3) | <0.001 |
| Congestive heart failure | 901 (35.2) | 265 (52.1) | <0.001 |
| Other heart diseases | 1376 (54.0) | 258 (51.0) | 0.221 |
| Cerebrovascular disease | 390 (15.2) | 336 (66.1) | <0.001 |
| Other chronic neurological disorder | 203 (7.9) | 152 (29.9) | <0.001 |
| Renal insufficiency | 419 (16.4) | 121 (24.0) | <0.001 |
| Chronic liver disease | 83 (3.2) | 14 (2.8) | 0.575 |
| Diabetes mellitus | 726 (28.3) | 170 (33.3) | 0.022 |
| Malignancy | 371 (14.5) | 58 (11.6) | 0.088 |
BMI, body mass index; CAP, community-acquired pneumonia; NHAP, nursing-home-acquired pneumonia.