Table 2.
Demographic and socioeconomic index of lung cancer cases by stage at diagnosis, 2005–2014
| Characteristic | Nonadvanced stagea | Advanced stageb | Unstaged | χ b, c |
|---|---|---|---|---|
| No. (%) | No. (%) | No. (%) | P | |
| Sex | ||||
| Male | 2909 (55.3) | 2210 (42.0) | 143 (2.7) | 0.262 |
| Female | 1048 (54.5) | 846 (44.0) | 28 (1.5) | |
| Age at diagnosis, years | ||||
| <50 | 219 (42.2) | 277 (53.4) | 23 (4.4) | <0.001 |
| 50–74 | 2870 (55.4) | 2192 (42.3) | 118 (2.3) | |
| ≥75 | 868 (58.5) | 587 (39.5) | 30 (2.0) | |
| Marital status | ||||
| Single | 41 (62.1) | 23 (34.9) | 2 (3.0) | 0.343 |
| Married | 3874 (55.0) | 3005 (42.6) | 169 (2.4) | |
| Widowed/divorced | 22 (62.9) | 13 (37.1) | 0 (0.0) | |
| Missing | 20 (57.1) | 15 (42.9) | 0 (0.0) | |
| Body mass index | ||||
| <25 | 2913 (56.2) | 2160 (41.7) | 111 (2.1) | <0.001 |
| 25–30 | 679 (63.1) | 369 (34.3) | 29 (2.7) | |
| ≥30 | 54 (70.1) | 19 (24.7) | 4 (5.2) | |
| Missing | 311 (36.8) | 508 (60.1) | 27 (3.2) | |
| Medical insurance type | ||||
| UBMI | 1209 (57.2) | 855 (40.5) | 48 (2.3) | <0.001 |
| NRCMI | 996 (53.2) | 848 (45.3) | 30 (1.6) | |
| Commercial insurance | 101 (82.8) | 21 (17.2) | 0 (0.0) | |
| Social medicine | 39 (39.0) | 59 (59.0) | 2 (2.0) | |
| Self pay | 994 (57.7) | 682 (39.6) | 46 (2.7) | |
| Others | 40 (78.4) | 9 (17.7) | 2 (3.9) | |
| Missing | 578 (48.1) | 582 (48.4) | 43 (3.6) | |
| Smoking | ||||
| Current smoker | 1820 (58.7) | 1197 (38.6) | 82 (2.7) | <0.001 |
| Ex‐smoker | 544 (54.8) | 423 (42.6) | 25 (2.5) | |
| Never smoker | 1539 (51.2) | 1409 (46.8) | 61 (2.0) | |
| Missing | 54 (64.3) | 27 (32.1) | 3 (3.6) | |
| Drinking | ||||
| Yes | 1110 (54.4) | 882 (43.2) | 50 (2.5) | 0.586 |
| No | 2575 (53.7) | 2107 (43.9) | 116 (2.4) | |
| Missing | 272 (79.1) | 67 (19.5) | 5 (1.5) | |
| History of respiratory diseases | ||||
| Yes | 286 (61.4) | 167 (35.8) | 13 (2.8) | <0.05 |
| No | 3671 (54.6) | 2889 (43.0) | 158 (2.4) | |
| Educational level | ||||
| Illiterate | 397 (49.1) | 386 (47.7) | 26 (3.2) | 0.198 |
| Primary school | 605 (52.8) | 513 (44.7) | 29 (2.5) | |
| Middle school | 662 (52.6) | 563 (44.8) | 33 (2.6) | |
| High school | 419 (55.1) | 319 (41.9) | 23 (3.0) | |
| College degree or above | 222 (51.6) | 201 (46.7) | 7 (1.6) | |
| Missing | 1652 (59.5) | 1074 (38.7) | 53 (1.9) | |
| Occupational level | ||||
| Nonfarmer | 1749 (54.8) | 1366 (42.8) | 74 (2.3) | <0.05 |
| Farmer | 1518 (51.3) | 1367 (46.2) | 76 (2.6) | |
| Missing | 690 (66.7) | 323 (31.2) | 21 (2.0) | |
| Area SES tertile | ||||
| 1 (lowest) | 1268 (46.1) | 1317 (47.9) | 167 (6.1) | <0.001 |
| 2 | 848 (43.2) | 1110 (56.6) | 4 (0.2) | |
| 3 (highest) | 1841 (74.5) | 629 (25.5) | 0 (0.0) | |
UBMI, urban basic medical insurance; NRCMI, new rural cooperative medical insurance.
a
Nonadvanced stage: StageI–IIIA.
b
Advanced stage: Stage IIIB–IV.
c
Participants who were diagnosed with unstaged lung cancer or lack of demographic information were not included in chi‐square test or the Fisher exact test. And none of the variables meet the criteria of Fisher exact test.