Table I.
Patient characteristics according to the RDW groups.
| RDW (fl) | |||
|---|---|---|---|
| Variables (patient no. evaluated per variable) | <50 | ≥50 | P-value |
| Age, years (338) | 0.859 | ||
| <68 | 156 | 12 | |
| ≥68 | 157 | 13 | |
| Sex (338) | 0.03a | ||
| Male | 191 | 21 | |
| Female | 122 | 4 | |
| Body mass index, kg/m2 (338) | 0.328 | ||
| ≤23 | 156 | 15 | |
| >23 | 157 | 10 | |
| Brinkman index | 0.349 | ||
| <400 | 143 | 9 | |
| ≥400 | 170 | 16 | |
| Anemia (338) | 0.053 | ||
| Absent | 280 | 19 | |
| Present | 33 | 6 | |
| Carcinoembryonic antigen, ng/ml (326) | 0.428 | ||
| ≤5 | 212 | 15 | |
| >5 | 101 | 10 | |
| Diabetes mellitus (338) | 0.02a | ||
| Absent | 260 | 25 | |
| Present | 53 | 0 | |
| Heart disease (338) | 0.694a | ||
| Absent | 291 | 23 | |
| Present | 22 | 2 | |
| History of malignancy (338) | 1a | ||
| Absent | 260 | 21 | |
| Present | 53 | 4 | |
| Charlson Comorbidity Index (338) | 0.282 | ||
| 0-1 | 56 | 7 | |
| 2+ | 257 | 18 | |
| %VC (336) | 0.137a | ||
| ≥80 | 306 | 23 | |
| <80 | 7 | 2 | |
| FEV1.0% (338) | 0.019 | ||
| ≥70 | 241 | 14 | |
| <70 | 72 | 11 | |
| SUVmax (246) | 0.098 | ||
| <4.4 | 114 | 5 | |
| ≥4.4 | 199 | 20 | |
| cTNM (338) | 0.559a | ||
| I | 269 | 20 | |
| II | 39 | 5 | |
| III | 5 | 0 | |
| Pathological subtype (338) | 0.116 | ||
| Adenocarcinoma | 244 | 15 | |
| Squamous cell carcinoma | 38 | 5 | |
| Others | 31 | 5 | |
aFisher's exact test. The χ2 or Fisher's exact tests were used for categorical covariates. RDW, red blood cell distribution width; VC, vital capacity; FEV1.0, forced expiratory volume in 1 sec; SUVmax, maximum standardized uptake value; cTNM, clinical TNM stage.