Table 1. Distribution of demographic and clinical variables by survival status.
| Variable | Dead (n = 456) | Alive (n = 142) | P value* |
| Number (%) | Number (%) | ||
| Gender | |||
| Men | 262 (81.11) | 61 (18.89) | |
| Women | 194 (70.55) | 81 (29.45) | 0.002 |
| Ethnicity | |||
| Caucasian | 358 (76.17) | 112 (23.83) | |
| African American | 72 (75.79) | 23 (24.21) | |
| Other | 26 (78.79) | 7 (21.21) | 0.937 |
| Smoking status | |||
| Never smoker | 84 (75.00) | 28 (25.00) | |
| Former smoker | 184 (74.72) | 59 (24.28) | |
| Current smoker | 188 (77.37) | 55 (22.63) | 0.860 |
| Clinical stage | |||
| IIIA | 57 (69.51) | 25 (30.49) | |
| IIIB (Dry) | 100 (70.42) | 42 (29.58) | |
| IIIB (Wet) | 25 (60.10) | 14 (35.90) | |
| IV | 274 (81.79) | 61 (18.21) | 0.004 |
| Performance status | |||
| 0 | 96 (67.13) | 47 (32.87) | |
| 1 | 254 (76.05) | 80 (23.95) | |
| 2-4 | 66 (89.19) | 8 (10.81) | <0.002 |
| Therapy | |||
| Chemotherapy | 295 (64.69) | 60 (16.90) | |
| Chemoradiotherapy | 104 (76.47) | 32 (23.53) | |
| Both | 57 (53.27) | 50 (46.73) | <0.001 |
| Age, years (mean±SD) | 59.7±10.6 | 59.6±10.0 | 0.884 |
| Pack-years (mean±SD) | 36.6±30.4 | 36.9±31.3 | 0.926 |
*Significant P values are in bold font.