Table 1.
Descriptive statistics for the study variables
| Measure | α | All M (SD) |
MZm M (SD) |
MZf M (SD) |
DZm M (SD) |
DZf M (SD) |
DZOSm M (SD) |
DZOSf M (SD) |
|---|---|---|---|---|---|---|---|---|
| AQ-social (self-report) | 0.79 | 14.91 (4.09) | 14.76 (3.99) | 15.10 (4.26) | 14.76 (3.85) | 15.23 (4.34) | 14.78 (3.79) | 14.66 (4.11) |
| AQ_detail (self-report) | 0.80 | 9.90 (3.50) | 10.23 (3.51) | 9.53 (3.41) | 10.15 (3.55) | 9.70 (3.51) | 10.50 (3.60) | 9.49 (3.33) |
| AQ-social (parent-report) | 0.85 | 40.78 (9.72) | 41.88 (9.57) | 39.69 (9.31) | 42.10 (9.99) | 40.11 (9.49) | 43.05 (10.65) | 38.66 (8.71) |
| AQ_detail (parent-report) | 0.84 | 9.35 (3.74) | 9.50 (3.85) | 8.86 (3.61) | 9.47 (3.84) | 9.24 (3.68) | 10.18 (3.91) | 9.05 (3.44) |
| Face memory | – | 53.96 (9.75) | 52.58 (9.88) | 54.28 (9.42) | 53.56 (10.19) | 54.71 (9.87) | 52.81 (9.87) | 54.99 (9.40) |
| Object memory | – | 50.04 (10.30) | 54.03 (10.73) | 47.51 (9.30) | 53.98 (10.69) | 47.27 (9.51) | 53.01 (10.67) | 48.33 (9.05) |
Face memory Cambridge Face Memory Test, Object memory Cambridge Car Memory Test, MZ monozygotic, DZ dizygotic, SS same-sex, OS opposite-sex, m male, f female; one twin from each pair was drawn randomly for use in these analyses