Table 3. Baseline characteristic of observational studies and included RCTs.
| Baseline characteristic | OSs (N=35,142) | RCTs (N=2,602) | P |
|---|---|---|---|
| Mean age (y) | 63.5 | 64.9 | 0.36 |
| Female (%) | 51.5 | 46.6 | 0.49 |
| BMI (kg/m2) | 28.2 | 27.0 | 0.06 |
| Metastatic cancer (%) | 54.7 | 43.1 | 0.10 |
| Hematologic cancer (%) | 13.6 | 10.1 | 0.44 |
| Gastric cancer (%) | 9.0 | 6.5 | 0.51 |
| Pancreas cancer (%) | 6.2 | 3.8 | 0.44 |
| Lung cancer (%) | 14.6 | 11.2 | 0.47 |
| Lymphoma (%) | 6.3 | 5.0 | 0.69 |
| Gynecologic cancer (%) | 7.3 | 8.9 | 0.68 |
| Bladder cancer (%) | 3.9 | 3.9 | 1.00 |
| Brain cancer (%) | 3.4 | 1.3 | 0.33 |
P was conducted by t-test for continuous variable and chi-square test for dichotomy variable. BMI, body mass index; RCT, randomized controlled trial; OS, observational study.