Table 3. Percentage of cases of unprotected last coitus by sex, age group, and genotype among adolescents, United States 1994-2002.
| Males (N=1971) | Females (N=2092) | |||
|---|---|---|---|---|
|
| ||||
| Genotype | Age ≤18 (N) | Age >18 (N) | Age ≤ 18 (N) | Age >18 (N) |
|
| ||||
| DAT1 | ||||
| 9R/9R | 25.71 (35) | 30.19 (53) | 27.59 (29) | 20.37 (54) |
| 9R/10R | 25.29 (257) | 23.82 (382) | 39.27 (275) | 34.07 (408) |
| 10R/10R | 29.18 (490) | 30.04 (669) | 31.60 (519) | 31.96 (751) |
| −/− | 20.00 (40) | 26.67 (45) | 44.44 (27) | 20.69 (29) |
| DRD2 | ||||
| A1/A1 | 15.63 (64) | 22.22 (90) | 29.87 (77) | 20.83 (96) |
| A2/A2 | 27.70 (444) | 25.73 (614) | 33.49 (433) | 31.14 (684) |
| A1/A2 | 29.30 (314) | 31.91 (445) | 36.47 (340) | 35.28 (462) |
| MAOA | ||||
| 2R/− | 37.50 (16) | 45.45 (11) | 58.62 (29) | 48.39 (31) |
| −/− | 27.17 (806) | 27.68 (1138) | 33.50 (821) | 31.46 (1211) |
Boldface indicates that the results are consistent with the following hypotheses: (1) DAT1*9R/9R respondents have lower rates of unprotected sex than other DAT1 genotypes; (2) DRD2*A1/A2 respondents have higher rates of unprotected sex than other DRD2 genotypes; and (3)MAOA*2R respondents have higher rates of unprotected sex than other MAOA genotypes. Formal hypothesis tests are presented in Table 4. The symbol ‘−‘ indicates an unlisted allele (e.g., neither 9R nor 10R for DAT1 gene).
Source: As for Table 1.