Table 1. Baseline demographic and clinicopathologic characteristics of the 849,088 study patients.
| Characteristic | All patients % (n = 849,088) | NHW % (n = 672,863) | Black % (n = 91,654) | HW % (n = 40,045) | Asian % (n = 44,526) | P |
|---|---|---|---|---|---|---|
| Age at diagnosis, years | 0.0001a | |||||
| <Mean (median) | 69.0 (70.0) | 69.7 (71.0) | 65.7 (66.0) | 68.3 (70.0) | 69.0 (70.0) | |
| Age group, years | <0.0001 | |||||
| <30 | 0.1 | 0.1 | 0.1 | 0.5 | 0.2 | |
| 30–39 | 0.6 | 0.5 | 0.9 | 1.4 | 1.2 | |
| 40–49 | 4.4 | 3.8 | 7.5 | 5.6 | 5.2 | |
| 50–59 | 14.6 | 13.7 | 21.7 | 14.8 | 14.6 | |
| 60–69 | 28.4 | 28.2 | 31.1 | 27.5 | 26.4 | |
| 70–79 | 33.1 | 34.0 | 26.8 | 32.1 | 32.7 | |
| ≥80 | 18.8 | 19.7 | 11.9 | 18.1 | 19.7 | |
| Sex | <0.0001 | |||||
| Female | 45.4 | 46.4 | 41.0 | 44.6 | 40.5 | |
| Male | 54.6 | 53.6 | 59.0 | 55.4 | 59.5 | |
| Marital status | <0.0001 b | |||||
| Single | 11.1 | 9.5 | 26.2 | 14.5 | 8.9 | |
| Married | 51.6 | 55.0 | 37.2 | 53.8 | 66.5 | |
| Other | 33.5 | 35.5 | 36.6 | 31.7 | 24.6 | |
| Unknown | 3.8 | -- | -- | -- | -- | |
| TNM stage | <0.0001 b | |||||
| I | 16.4 | 20.9 | 16.3 | 16.9 | 18.1 | |
| II | 3.3 | 4.1 | 3.6 | 3.4 | 3.7 | |
| III | 22.7 | 27.5 | 29.8 | 26.8 | 28.0 | |
| IV | 39.5 | 47.5 | 50.3 | 52.9 | 50.2 | |
| Unknown | 18.1 | -- | -- | -- | -- | |
| SEER summary stage | <0.0001 b | |||||
| Localized | 18.3 | 20.8 | 16.8 | 17.3 | 17.1 | |
| Regional | 23.8 | 26.4 | 25.8 | 23.6 | 23.6 | |
| Distant | 49.3 | 52.8 | 57.4 | 59.1 | 59.3 | |
| Unknown | 8.6 | -- | -- | -- | -- | |
| Cancer-directed surgery | <0.0001 b | |||||
| Not performed | 78.1 | 77.3 | 82.9 | 80.6 | 78.7 | |
| Performed | 21.8 | 22.7 | 17.1 | 19.4 | 21.3 | |
| Unknown | 0.1 | -- | -- | -- | -- | |
| Reason for no surgery | <0.0001 b | |||||
| Died | 3.7 | 4.5 | 3.5 | 3.5 | 2.6 | |
| Not recommended | 81.7 | 92.7 | 93.7 | 94.2 | 94.2 | |
| Patient refused | 2.5 | 2.8 | 2.8 | 2.3 | 3.2 | |
| Unknown | 12.1 | -- | -- | -- | -- | |
| Radiation treatment | <0.0001 b | |||||
| Not received | 59.3 | 62.0 | 58.3 | 66.0 | 62.8 | |
| Received | 36.7 | 38.0 | 41.7 | 34.0 | 37.2 | |
| Unknown | 4.0 | -- | -- | -- | -- | |
| Lymph node status | <0.0001 | |||||
| Negative | 55.9 | 56.8 | 50.0 | 55.1 | 53.0 | |
| Positive | 44.1 | 43.2 | 50.0 | 44.9 | 47.0 | |
| Tumor location | <0.0001 | |||||
| Main bronchus | 5.0 | 5.1 | 5.1 | 5.4 | 4.0 | |
| Upper lobe, lung | 47.3 | 47.1 | 51.0 | 43.2 | 45.7 | |
| Middle lobe, lung | 4.1 | 4.1 | 4.3 | 4.0 | 4.9 | |
| Lower lobe, lung | 23.1 | 23.3 | 19.8 | 23.6 | 25.4 | |
| Overlapping | 1.4 | 1.4 | 1.5 | 1.5 | 1.3 | |
| Lung, NOS | 19.1 | 19.0 | 18.3 | 22.3 | 18.7 | |
| Tumor histology | <0.0001 | |||||
| Small cell | 22.5 | 23.2 | 20.9 | 21.1 | 17.7 | |
| Squamous cell | 19.7 | 19.7 | 22.5 | 17.3 | 15.7 | |
| Large cell | 4.4 | 4.3 | 5.3 | 3.9 | 3.6 | |
| Adenocarcinoma | 30.9 | 30.0 | 30.8 | 33.3 | 41.4 | |
| BAC | 2.9 | 2.9 | 2.2 | 3.5 | 4.6 | |
| Other | 19.6 | 19.9 | 18.3 | 20.9 | 17.0 |
NOS: not otherwise specified
a Kruskal-Wallis equality-of-populations rank test.
b calculated after exclusion of patients in the Unknown category.