Table 3 Descriptive Statistics for the Exposures, Outcomes and Covariates*
Variables | n | Missing | Mean (SD) | Median (IQR) | Range | |
|---|---|---|---|---|---|---|
n | % | |||||
Exposures | ||||||
PDQI score | 77,768 | 0 | 0% | 83.1 (9.3) | 83.9 (12.7) | 38.7–107.1 |
UPFI score | 77,768 | 0 | 0% | 31.8 (9.7) | 31.2 (12.7) | 0–89.5 |
CDQI score | 32,937 | 44,831 | 58% | 60.3 (10.6) | 61.5 (13.9) | 2.8–86.5 |
Outcomes | ||||||
ADHD symptom score | 37,796 | 39,972 | 51% | 8.4 (7.1) | 7 (7) | 0–54 |
ADHD diagnosis, NPR | 0 | 0% | ||||
Yes | 2546 | |||||
No | 75,222 | |||||
Covariates | ||||||
Maternal age | 77,768 | 0 | 0% | 30.2 (4.5) | 30 (6) | 15–47 |
Pre-pregnant BMI | 75,804 | 1964 | 3% | 24.0 (4.3) | 23.1 (4.8) | 12.5–57.8 |
Maternal ADHD symptom score, mean | 46,976 | 30,792 | 40% | 1.1 (0.57) | 1 (0.83) | 0–4 |
Maternal Hopkins symptom score, mean | 76,321 | 1447 | 2% | 0.25 (0.39) | 0 (0.4) | 0–3 |
Maternal completed education | 0 | 0% | ||||
< 12 years | 5474 | |||||
Upper secondary | 21,234 | |||||
Bachelor | 32,497 | |||||
Master | 18,563 | |||||
Prenatal smoking | 1099 | 1% | ||||
Yes | 5816 | |||||
No | 70,853 | |||||
Prenatal energy intake (MJ) | 77,768 | 0 | 0% | 9.7 (2.6) | 9.4 (3.2) | 4.5–20 |
Parity | 0 | 0% | 0.8 (0.8) | 1 (1) | 0–3 | |
0 | 35,140 | |||||
1 | 27,922 | |||||
2 | 11,634 | |||||
3 | 3072 | |||||
Child sex | 0 | 0% | ||||
Girls | 38,037 | |||||
Boys | 39,731 | |||||
Child sleep problems at 3 y | 29,594 | 38% | ||||
Yes | 2648 | |||||
No | 45,526 | |||||