| Characteristic | RT alone | CRT | p-value | |
| Unadjusted | Adjusted# | |||
| Subjects n | 2222 | 784 | ||
| Age yrs | ||||
| 66–70 | 363 (17) | 248 (29) | <0.0001 | 0.68 |
| 71–75 | 594 (27) | 279 (33) | ||
| >75 | 1205 (56) | 317 (38) | ||
| Female | 1071 (50) | 373 (44) | 0.008 | 0.96 |
| Race | ||||
| White | 1861 (87) | 729 (86) | 0.40 | 0.99 |
| African-American | 184 (8) | 71 (8) | ||
| Hispanic | 16 (1) | 11 (1) | ||
| Other | 101 (5) | 33 (4) | ||
| Marital status | ||||
| Married | 1037 (48) | 492 (58) | <0.0001 | 0.93 |
| Median income in ZIP code of residence | ||||
| Lowest quartile | 634 (29) | 252 (30) | 0.46 | 0.99 |
| Second quartile | 555 (26) | 231 (27) | ||
| Third quartile | 532 (25) | 210 (25) | ||
| Highest quartile | 439 (20) | 151 (18) | ||
| Charlson comorbidity score | ||||
| ≤1 | 599 (28) | 290 (34) | <0.0001 | 0.97 |
| 1–2 | 721 (33) | 311 (37) | ||
| >2 | 842 (39) | 243 (29) | ||
| Histology | ||||
| Adenocarcinoma | 682 (32) | 266 (32) | 0.19 | 0.99 |
| Squamous cell carcinoma | 1015 (47) | 413 (49) | ||
| Large cell carcinoma | 188 (9) | 80 (9) | ||
| Other | 277 (13) | 85 (10) | ||
| Tumour location | ||||
| Upper lobe | 1243 (57) | 488 (58) | 0.001 | 0.73 |
| Middle lobe | 107 (5) | 27 (3) | ||
| Lower lobe | 714 (33) | 262 (31) | ||
| Main bronchus | 81 (4) | 54 (6) | ||
| Other | 17 (1) | 13 (2) | ||
| Tumour size mm | ||||
| ≤20 | 329 (20) | 73 (12) | <0.0001 | 0.99 |
| 20–30 | 427 (29) | 149 (24) | ||
| 30–50 | 578 (35) | 222 (36) | ||
| 50–70 | 201 (12) | 122 (20) | ||
| >70 | 60 (4) | 53 (9) | ||
| Stage | ||||
| I | 1781 (82) | 584 (69) | <0.0001 | 0.79 |
| II | 381 (18) | 260 (31) | ||
Data are presented as n (%), unless otherwise stated. #: p-values adjusting for propensity scores.