Table 3. Distribution of genotypes of the CNV-3956 by smoking status in Chinese populations.
| CNV-3956 genotypes | |||
|---|---|---|---|
| 2-Copy, n % | 3-Copy, n % | ≥4-Copy, n % | |
| Smoking status | |||
| Never (n=4050) | 2517 (52.6) | 539 (51.2) | 994 (52.1) |
| Former (n=1463) | 887 (18.6) | 220 (20.9) | 356 (18.7) |
| Current (n=2230) | 1378 (28.8) | 294 (27.9) | 558 (29.2) |
| Group test P-valuea | 0.499 | ||
| Pack-years smokedb | |||
| ≤ 15 (n=1016) | 657 (29.0) | 156 (30.4) | 203 (22.2) |
| 15–43 (n=1749) | 1052 (46.5) | 248 (48.2) | 449 (49.1) |
| ≥43 (n=928) | 556 (24.5) | 110 (21.4) | 262 (28.7) |
| Group test P-valuea | 3.00 × 10−4 | ||
a
The two-sided χ2 test between difference groups.
b
Categorized by using the 25th and 75th percentile pack-years smoked as the cutoff points.