Appendix 1—table 1. Descriptive statistics of full MoBa sample (N=113,691)*.
| Continuous variables | mean | SD | N obs | |
|---|---|---|---|---|
| Maternal age at birth | 30.1 | 4.6 | 113,691 | |
| Paternal age at birth | 32.7 | 5.5 | 113,172 | |
| Maternal depressive/anxiety symptoms, based on 5 items from the Hopkins Symptoms Checklist-25 (SCL-25)† |
1.3 | 2.0 | 100,570 | |
| Paternal depressive/anxiety symptoms, based on 8 items from the Hopkins Symptoms Checklist-25 (SCL-25)‡ |
1.2 | 2.1 | 77,018 | |
| Maternal ADHD symptoms: adult ADHD self-report scale§ | 6.6 | 3.5 | 56,255 | |
| Paternal ADHD symptoms: adult ADHD self-report scale¶ | 8.2 | 3.2 | 34,425 | |
| Maternal pre-pregnancy BMI (kg/m2) | 24.0 | 4.1 | 100,060 | |
| Paternal BMI (kg/m2) | 25.9 | 3.3 | 79,536 | |
| Child’s BMI at age 8 (kg/m2) | 16.2 | 2.0 | 36,894 | |
| Child depressive symptoms age 8: Short Mood and Feelings Questionnaire (SMFQ)** | 1.9 | 2.4 | 43,065 | |
| Child anxiety symptoms age 8: Screen for Child Anxiety Related Disorders (SCARED)†† | 1.0 | 1.2 | 43,298 | |
| Child ADHD symptoms age 8: Parent/Teacher Rating Scale for Disruptive Behaviour Disorders (RS-DBD)‡ ‡ | 8.5 | 7.2 | 43,238 | |
| Child ADHD symptoms (inattention) age 8: Parent/Teacher Rating Scale for Disruptive Behaviour Disorders (RS-DBD)§ § | 5.0 | 4.1 | 43,194 | |
| Child ADHD symptoms (hyperactivity) age 8: Parent/Teacher Rating Scale for Disruptive Behaviour Disorders (RS-DBD)§ § | 3.6 | 3.9 | 43,177 | |
| Categorical variables | Category | % | N obs | |
| Child’s sex | male | 51.3 | 113,477 | |
| female | 48.7 | |||
| maternal educational qualifications | 9 year elementary education | 2.8 | 101,020 | |
| Up to 2 years further education | 5.2 | |||
| Further education: vocational | 12.8 | |||
| Further education: general studies, sixth form | 15.7 | |||
| Higher education: college/university, up to 4 years | 40.9 | |||
| Higher education: college/university, over 4 years | 22.6 | |||
| paternal educational qualifications | 9 year elementary education | 4.8 | 100,891 | |
| Up to 2 years further education | 6.6 | |||
| Further education: vocational | 26.2 | |||
| Further education: general studies, sixth form | 13.2 | |||
| Higher education: college/university, up to 4 years | 26.5 | |||
| Higher education: college/university, over 4 years | 22.7 | |||
| maternal parity at child’s birth | 0 | 44.0 | 113,691 | |
| 1 | 35.9 | |||
| 2 | 15.6 | |||
| 3 | 3.4 | |||
| 4+ | 1.1 | |||
| Mother’s marital status at birth | Married/registered partner | 95.5 | 113,691 | |
| single | 4.5 | |||
| Mother’s smoked during pregnancy | never | 49.9 | 101,373 | |
| Stopped before week 17 | 41.7 | |||
| Currently, sometimes | 2.8 | |||
| Currently, daily | 5.6 | |||
*
All participants in the birth registry file who had not withdrawn consent.
†
Possible range: 0–15.
‡
Possible range: 0–24.
§
Possible range: 0–24.
¶
Possible range: 0–24.
**
Possible range: 0-26.
††
Possible range: 0-10.
‡ ‡
Possible range: 0–54.
§ §
Possible range: 0–27.