Table 1.
Baseline characteristics of patients with lung adenocarcinoma.
| Characteristic | Married | Divorced | Single | Widowed | Total | P value |
| Number of patients | 33,713 (54.4) | 8804 (14.2) | 9516 (15.4) | 9895 (16) | 61,928 (100) | |
| Sex | <.001 | |||||
| Male | 18,731 (55.6) | 3742 (42.5) | 4767 (50.1) | 2220 (22.4) | 29,460 (47.6) | |
| Female | 14,982 (44.4) | 5062 (57.5) | 4749 (49.9) | 7675 (77.6) | 32,468 (52.4) | |
| Age | <.001 | |||||
| <65 | 13,783 (40.9) | 4326 (49.1) | 5850 (61.5) | 1251 (12.6) | 25,210 (40.7) | |
| ≥65 | 19,930 (59.1) | 4478 (50.9) | 3666 (38.5) | 8644 (87.4) | 36,718 (59.3) | |
| Race | <.001 | |||||
| White | 26,685 (79.2) | 6942 (78.9) | 6217 (65.3) | 7911 (79.9) | 47,755 (77.1) | |
| Black | 2759 (8.2) | 1384 (15.7) | 2637 (27.7) | 1042 (10.5) | 7822 (12.6) | |
| Other | 4269 (12.7) | 478 (5.4) | 662 (7) | 942 (9.5) | 6351 (10.3) | |
| Grade | <.001 | |||||
| I | 2549 (7.6) | 597 (6.8) | 542 (5.7) | 826 (8.3) | 4514 (7.3) | |
| II | 7176 (21.3) | 1742 (19.8) | 1739 (18.3) | 2111 (21.3) | 12,768 (20.6) | |
| III | 8714 (25.8) | 2301 (26.1) | 2614 (27.5) | 2218 (22.4) | 15,847 (25.6) | |
| IV | 176 (0.5) | 49 (0.6) | 58 (0.6) | 45 (0.5) | 328 (0.5) | |
| Unknown | 15,098 (44.8) | 4115 (46.7) | 4563 (48) | 4695 (47.4) | 28,471 (46) | |
| TNM stage | <.001 | |||||
| I | 7111 (21.1) | 1904 (21.6) | 1784 (18.7) | 2490 (25.2) | 7111 (21.5) | |
| II | 2315 (6.9) | 639 (7.3) | 623 (6.5) | 796 (8) | 2315 (7.1) | |
| III | 5930 (17.6) | 1649 (18.7) | 1675 (17.6) | 1716 (17.3) | 5930 (17.7) | |
| IV | 18,357 (54.5) | 4612 (52.4) | 5434 (57.1) | 4893 (49.4) | 18,357 (53.8) | |
| Surgery | <.001 | |||||
| Yes | 9467 (28.1) | 2322 (26.4) | 2125 (22.3) | 2286 (23.1) | 16,200 (26.2) | |
| No | 24,246 (71.9) | 6482 (73.6) | 7391 (77.7) | 7609 (76.9) | 45,728 (73.8) | |
| Radiotherapy | <.001 | |||||
| Yes | 14,900 (44.2) | 4077 (46.3) | 4252 (44.7) | 3933 (39.7) | 27,162 (43.9) | |
| None, refused or unknown | 18,813 (55.8) | 4727 (53.7) | 5264 (55.3) | 5962 (60.3) | 34,766 (56.1) | |
| Chemotherapy | <.001 | |||||
| Yes | 20,380 (60.5) | 4850 (55.1) | 5270 (55.4) | 4193 (42.4) | 34,693 (56) | |
| No/unknown | 13,333 (39.5) | 3954 (44.9) | 4246 (44.6) | 5702 (57.6) | 27,235 (44) | |
| Cancer-specific death | <.001 | |||||
| Events | 20,452 (60.7) | 5469 (62.1) | 6031 (63.4) | 6112 (61.8) | 38,064 (61.5) | |
| Censored | 13,261 (39.3) | 3335 (37.9) | 3485 (36.6) | 3783 (38.2) | 13,261 (38.5) | |
| Median household income | <.001 | |||||
| <3946 | 8319 (24.7) | 2374 (27) | 2235 (23.5) | 2418 (24.4) | 15,346 (24.8) | |
| 3946–4494 | 8118 (24.1) | 2178 (24.7) | 2727 (28.7) | 2469 (25) | 15,492 (25) | |
| 4494–5400 | 8384 (24.9) | 2277 (25.9) | 2355 (24.7) | 2544 (25.7) | 15,560 (25.1) | |
| ≥5400 | 8892 (26.4) | 1975 (22.4) | 2199 (23.1) | 2464 (24.9) | 15,530 (25.1) |