| Low z | High z | Neither | TOTAL | |
| Low SNS | 13 | 0 | 4 | 17 |
| High SNS | 0 | 8 | 5 | 13 |
| Neither | 16 | 5 | 3977 | 3998 |
| TOTAL | 29 | 13 | 3986 | 4028 |