Table 1.
Distribution of selected characteristics among SCLC cases and controls
| Variable | Huaian set | Jinan set | ||||
|---|---|---|---|---|---|---|
|
|
|
|||||
| Cases | Controls | P a | Cases | Controls | P a | |
|
|
|
|||||
| n (%) | n (%) | n (%) | n (%) | |||
| 200 | 400 | 320 | 640 | |||
| Age (year)b | 1.000 | 0.615 | ||||
| ≤ 57 | 99 (49.5) | 198 (49.5) | 156 (48.9) | 301 (47.0) | ||
| > 57 | 101 (50.5) | 202 (50.5) | 164 (51.2) | 339 (53.0) | ||
| Sex | 0.479 | 0.480 | ||||
| Male | 148 (74.0) | 285 (71.3) | 251 (78.4) | 489 (76.4) | ||
| Female | 52 (26.0) | 115 (28.7) | 69 (21.6) | 151 (23.6) | ||
| Smoking status | < 0.001 | < 0.001 | ||||
| Yes | 157 (78.5) | 113 (28.3) | 249 (77.8) | 219 (34.2) | ||
| No | 43 (21.5) | 287 (71.8) | 71 (22.2) | 421 (65.8) | ||
| Clinical stagec | ||||||
| Limited | 113 (56.5) | 182 (56.9) | ||||
| Extensive | 87 (43.5) | 138 (43.1) | ||||
Note: SCLC, small cell lung cancer.
a
Two-side χ2 test.
b
Median ages of patients for Shandong set and Jiangsu set are 57 years.
c
Classified according to the Veterans’ Administration Lung Study Group.