Table 1. Clinical Characteristics of Study Subjects Categorized by BMI Status.
| Characteristic | Entire cohort (n = 1197) | Low BMI (n = 500) | High BMI (n = 697) | P |
|---|---|---|---|---|
| Age (years) | 61.8 ± 9.9 | 61.5 ± 10.8 | 61.9 ± 9.2 | 0.456 |
| Sex, male | 708 (59.1) | 287 (57.4) | 421 (60.4) | 0.311 |
| BMI (kg/m2) | 23.6 ± 2.8 | 21.0 ± 1.5 | 25.5 ± 2.0 | < 0.001 |
| < 18.5 | 39 (3.3) | 39 (7.8) | ||
| 18.5–22.9 | 461 (38.5) | 461 (92.2) | ||
| 23.0–24.9 | 352 (29.4) | 352 (50.5) | ||
| 25.0–29.9 | 324 (27.1) | 324 (46.5) | ||
| ≥ 30.0 | 21 (1.8) | 21 (3.0) | ||
| Smoking status | 0.241 | |||
| Never-smoker | 607 (50.7) | 264 (52.8) | 343 (49.2) | |
| Ever-smoker (current or former) | 590 (49.3) | 236 (47.2) | 354 (50.8) | |
| Histological cell type | 0.339 | |||
| Non-squamous cell carcinoma | 1004 (83.9) | 413 (82.6) | 591 (84.8) | |
| Squamous cell carcinoma | 193 (16.1) | 87 (17.4) | 106 (15.2) | |
| Tumor differentiation | 0.915 | |||
| Well or moderate | 1098 (91.7) | 458 (91.6) | 640 (91.8) | |
| Poor | 99 (8.3) | 42 (8.4) | 57 (8.2) | |
| Pathologic T stage | 0.108 | |||
| T1a | 536 (44.8) | 206 (41.2) | 330 (47.3) | |
| T1b | 325 (27.2) | 145 (29.0) | 180 (25.8) | |
| T2a | 336 (28.0) | 149 (29.8) | 187 (26.8) | |
| Pathologic tumor size (cm) | 2.3 ± 0.9 | 2.3 ± 0.9 | 2.2 ± 0.9 | 0.349 |
| Lymphovascular invasion | 269 (22.5) | 110 (22.0) | 159 (22.8) | 0.779 |
| Visceral pleural invasion | 135 (11.3) | 47 (9.4) | 88 (12.6) | 0.095 |
| Type of resection | 0.860 | |||
| Wedge-segmentectomy | 152 (12.7) | 62 (12.4) | 90 (12.9) | |
| Lobectomy-pneumonectomy | 1045 (87.3) | 438 (87.6) | 607 (87.1) | |
| Tumor SUVbw | 5.2 ± 4.8 | 5.3 ± 4.8 | 5.2 ± 4.9 | 0.666 |
| Tumor SUVbsa | 1.4 ± 1.3 | 1.5 ± 1.4 | 1.3 ± 1.3 | 0.013 |
Data are numbers of patients (percentage) or mean ± standard deviation.
BMI, body mass index; SUVbw, maximum standardized uptake value normalized to body weight; SUVbsa, maximum standardized uptake value normalized to body surface area