| Null * 4交叉表 | ||||
| 计数 | ||||
|
| 4 | 总计 | ||
| 3 | 4 | |||
| Null | 0 | 22,066 | 193,286 | 215,352 |
| 1 | 22,526 | 192,873 | 215,399 | |
| Null | 8922 | 57,197 | 66,119 | |
| 总计 | 53,514 | 443,356 | 496,870 | |