Table 1.
Characteristics of the Norwegian mother, father, and child cohort attention-deficit/hyperactivity disorder substudy, 2004–2008.a
| MoBa preschool ADHD group N (%) or mean ± SD | MoBa typically developing children N (%) or mean ± SD | Weighted population (%) or mean ± SD | |
|---|---|---|---|
| Total N | 262 | 78 | |
| Maternal age at delivery (years) | |||
| <30 | 122 (46.6) | 26 (33.8) | (37.4) |
| 30 to 34.99 | 110 (42.0) | 31 (40.3) | (39.3) |
| ≥ 35 | 30 (11.5) | 20 (26.0) | (23.3) |
| Missing | 0 | 1 | |
| Child sex, N | |||
| Male | 146 (55.7) | 42 (53.9) | (56.9) |
| Female | 116 (44.3) | 36 (46.2) | (43.1) |
| Missing | 0 | 0 | |
| Maternal education, N (%) | |||
| Not a college graduate | 92 (35.7) | 19 (25.3) | (26.1) |
| College graduate | 110 (42.6) | 34 (45.3) | (48.5) |
| Post-college education | 56 (21.7) | 22 (29.3) | (25.4) |
| Missing | 4 | 3 | |
| Marital status | |||
| Single/Co-habiting | 147 (56.3) | 36 (46.2) | (48.7) |
| Married | 114 (43.7) | 42 (53.9) | (51.3) |
| Missing | 1 | 0 | |
| Parity | |||
| Nulliparous | 157 (59.9) | 43 (55.8) | (56.7) |
| Parous | 105 (40.1) | 34 (44.2) | (43.3) |
| Missing | 0 | 1 | |
| Maternal ADHD symptoms | 33 (12.7) | 5 (6.5) | (5.8) |
| Missing | 3 | 1 | |
| Maternal fish intake (g/day) | 26.1 (18.3) | 28.5 (17.6) | 28.5 (16.5) |
| Missing | 4 | 3 | |
| Any smoking in 1st or 2nd trimester | 61 (23.4) | 16 (20.8) | (24.9) |
| Missing | 1 | 1 | |
| Any alcohol consumption in 1st or 2nd trimester | 32 (13.3) | 8 (11.0) | (10.4) |
| Missing | 21 | 5 | |
| Experienced financial difficulty in the past year b | 68 (26.1) | 20 (25.6) | (28.8) |
| Missing | 1 | 0 | |
| Year of birth | |||
| 2004 | 26 (9.9) | 20 (25.6) | (22.0) |
| 2005 | 63 (24.1) | 30 (38.5) | (36.0) |
| 2006 | 90 (34.4) | 23 (29.5) | (33.3) |
| 2007 | 83 (31.7) | 5 (6.4) | (8.7) |
| Missing | 0 | 0 |
Weighted percentile sample size is 310.
Some percentiles may not equal 100 as a result of rounding.
aStudy enrollment occurred through January 2008; however, no study participants in this subpopulation were enrolled in January 2008.
bPast year = year before enrollment (around 17 weeks’ gestation).
MoBa indicates Norwegian Mother, Father, and Child Cohort Study; ADHD, attention-deficit/hyperactivity disorder; N, sample size; SD, standard deviation; g, grams.