Table 2. Quitters among participants or respondents.
| Males | Females | Total | |
| Total | 6/69 ( 8.7) | 2/32 ( 6.3) | 8/101 ( 7.9) |
| Genotypes with no enzyme activity* (One participant’s DNA was not available) | |||
| 0 | 1/16 ( 6.3) | 0/ 6 ( 0.0) | 1/22 ( 4.5) |
| 1 | 2/33 ( 6.1) | 0/15 ( 0.0) | 2/48 ( 4.2) |
| 2 | 3/17 (17.6) | 2/10 (20.0) | 5/27 (18.5) |
| 3 | 0/ 2 ( 0.0) | 0/ 1 ( 0.0) | 0/ 3 ( 0.0) |
| How do you feel the genotype tests ? (34 male respondents and 7 female respondents) | |||
| Glad to have participated | 4/19 (21.1) | 2/ 5 (40.0) | 6/24 (25.0) |
| Should not have participated | 0/ 0 | 0/ 0 | 0/ 0 |
| Neither | 0/ 7 ( 0.0) | 0/ 1 ( 0.0) | 0/ 8 ( 0.0) |
| Seems not to have participated | 2/ 6 (33.3) | 0/ 1 ( 0.0) | 2/ 7 (28.6) |
| Unspecified | 0/ 2 ( 0.0) | 0/ 0 | 0/ 2 ( 0.0) |
Percentages in parentheses.
*: GSTM1 null, GSTT1 null, and NQO1 609TT.