Table 1.
Descriptive statistics by ASR preference and behavior groups: mean (SD).
| Age (years) | Ethnicity | Right 2D:4D | Left 2D:4D | Childhood GNC | Adulthood GNC | |
|---|---|---|---|---|---|---|
| Gay men (n = 125) | 38.9 (13.9) | 2.58 (3.39) | 0.961 (0.054) | 0.958 (0.052) | 3.32 (0.41) | 3.17 (1.61) |
| Anal sex role preference | ||||||
| Bottom (n = 43) | 35.6 (14.8) | 3.49 (4.35) | 0.976 (0.049) | 0.964 (0.045) | 3.24 (0.45) | 3.7 (1.56) |
| Versatile (n = 51) | 39.2 (13.3) | 2 (2.59) | 0.958 (0.057) | 0.956 (0.051) | 3.28 (0.39) | 3.22 (1.64) |
| Top (n = 31) | 43 (12.9) | 2.32 (2.83) | 0.945 (0.049) | 0.951 (0.062) | 3.49 (0.35) | 2.35 (1.31) |
| Anal sex role behavior | ||||||
| Bottom (n = 45) | 37.2 (15.5) | 3.41 (4.24) | 0.966 (0.05) | 0.953 (0.047) | 3.24 (0.41) | 3.8 (1.51) |
| Versatile (n = 33) | 38.1 (13.8) | 1.94 (3) | 0.959 (0.058) | 0.963 (0.053) | 3.35 (0.4) | 3.12 (1.67) |
| Top (n = 44) | 41.4 (1.82) | 2.2 (2.57) | 0.956 (0.054) | 0.958 (0.058) | 3.38 (0.41) | 2.5 (1.41) |
Ethnicity was measured on a 13-point scale (1 = Caucasian, 2 = Black, 3 = Chinese, 4 = Filipino, 5 = Aboriginal, 6 = Latin American, 7 = Arab, 8 = Southeast Asian, 9 = West Asian, 10 = Korean, 11 = Japanese and 12 = other). Right- and left-hand digit ratios were calculated by dividing the length (mm) of the index finger (2D) by the length of the ring finger (4D). Childhood GNC was calculated based on an 18-item questionnaire, where lower scores indicate more gender nonconformity10. Adulthood GNC scores are derived from a on a 7-point Likert scale: 0 (more masculine), 3 (same), 6 (more feminine), thus higher scores indicate more gender nonconformity.