Table 1 Characteristics of the study population
Characteristics | Mean (SE) or % in girls | Mean (SE) or % in boys | P valuea |
|---|---|---|---|
N | 500 | 474 | Â |
Chronological age | 17.11 (0.05) | 17.16 (0.05) | 0.46 |
DNA methylation age acceleration (years) | − 0.24 (0.18) | 0.25 (0.17) | 0.05 |
Plasma cortisol (nmol/L) | 522.54 (15.99) | 465.85 (11.24) | < 0.01 |
Count of adverse childhood experiences | Â | Â | 0.85 |
 None | 21.5 | 22.0 |  |
 One | 24.4 | 25.9 |  |
 Two or three | 35.9 | 32.7 |  |
 Four or more | 18.2 | 19.4 |  |
Individual adverse childhood experience exposure | Â | Â | Â |
 Bullying | 14.4 | 17.1 | 0.26 |
 Emotional abuse | 22.9 | 21.9 | 0.75 |
 Emotional neglect | 14.6 | 16.9 | 0.34 |
 Parent mental health problem | 52.7 | 47.2 | 0.13 |
 Parent convicted | 13.1 | 11.6 | 0.60 |
 Parental separation | 20.9 | 25.9 | 0.11 |
 Physical abuse | 18.0 | 17.8 | 0.95 |
 Sexual abuse | 4.9 | 2.0 | 0.05 |
 Household substance abuse | 13.4 | 13.9 | 0.85 |
 Violence in household | 21.3 | 21.9 | 0.85 |