Table 3.
Sex differences in neurodevelopmental traits at age 9 in each latent class.
| Class 1 | Class 2 | Class 3 | Class 4 | ||
|---|---|---|---|---|---|
| (female: n = 79; | (female: n = 198; | (female: n = 112; | (female: n = 21; | ||
| male: n = 72) | male: n = 217) | male: n=131) | male: n = 10) | ||
| SRS-2 total raw score; mean (SD) | Female | 20.9 (11.1) | 30.1 (14.5) | 36.1 (17.1) | 54.8 (27.0) |
| Male | 24.5 (12.5) | 36.4 (16.0) | 45.2 (20.5) | 51.2 (21.1) | |
| Difference testing | β = 0.15, q = 0.12, η2 = 0.03 | β = 0.20, q <0.001, η2 = 0.04 | β = 0.23, q <0.001, η2 = 0.05 | β = −0.07, q = 0.77, η2 = 0.005 | |
| ADHD-RS total score; mean (SD) | Female | 3.2 (3.5) | 4.4 (4.7) | 5.5 (5.7) | 11.5 (7.5) |
| Male | 4.4 (4.9) | 8.4 (7.8) | 10.8 (9.1) | 12.0 (7.9) | |
| Difference testing | β = 0.15, q = 0.12, η2 = 0.008 | β = 0.30, q <0.001, η2 = 0.08* | β = 0.32, q <0.001, η2 = 0.05 | β = 0.03, q = 0.86, η2 = 0.01 | |
| WISC-IV full scale IQ; mean (SD) | Female | 108.4 (11.1) | 105.2 (12.7) | 98.4 (11.6) | 83.6 (16.4) |
| Male | 109.7 (14.5) | 100.8 (12.8) | 96.0 (13.5) | 78.4 (15.0) | |
| Difference testing | β = 0.05, q = 0.66, η2 = 0.002 | β = −0.17, q = 0.002, η2 = 0.03 | β = −0.10, q = 0.21, η2 = 0.01 | β = −0.15, q = 0.59, η2 = 0.02 |
*
η2 ≥ 0.06 (medium effect size). SRS-2, the Social Responsiveness Scale, Second Edition; ADHD-RS, ADHD-Rating Scale; WISC-IV, the Wechsler Intelligence Scale for Children-Fourth Edition Compared to the number of children assigned in the latent class growth analysis, there were attrition of 13% for females and 20% for males in Class 1, 17% for females and 14% for males in Class 2, 16% for females and 12% for males in Class 3, and 16% for females and 33% for males in Class 4.