Table 1.
Baseline Characteristics of the Three Study Groups (Mutually Exclusive): Youth with ADHD, ASD and Other Psychiatric Disorders
| |
ADHD diagnosis |
ASD diagnosis |
Other psychiatric diagnosesa |
|||
|---|---|---|---|---|---|---|
| |
(n=11,553) |
(n=9,698) |
(n=48,468) |
|||
| Variableb | n | % | n | % | n | % |
| Child: | ||||||
| Gender (male) | 8,961 | 78% | 7,727 | 80% | 24,425 | 50.4% |
| Gestation length (weeks)c | 39.3 | (2.3) | 39.5 | (2.1) | 39.4 | (2.1) |
| 5-minute Apgar scorec | 9.78 | (1.0) | 9.78 | (1.0) | 9.78 | (1.0) |
| Birth weight | ||||||
| Less than 1,500 g | 167 | 1.5% | 106 | 1.1% | 513 | 1.1% |
| 1,500–2,500 g | 679 | 6.2% | 482 | 5.2% | 2,591 | 5.7% |
| Above 2,500 g | 10,181 | 92.3% | 8,667 | 93.7% | 42,748 | 93.2% |
| Complications at birth | 2,754 | 23.8% | 2.598 | 26.8% | 7,996 | 16.5% |
| Mental retardation | 568 | 4.9% | 1,256 | 13.0% | 2,020 | 4.2% |
| Number of psychiatric disordersc | 2.3 | (4.3) | 2.8 | (4.3) | 2.8 | (3.9) |
| Number of injuries before age 5c | 1.0 | (1.5) | 0.8 | (1.3) | 0.7 | (1.2) |
| Parents: | ||||||
| Mother's age at childbirthc | 27.9 | (5.2) | 29.3 | (5.0) | 28.4 | (5.1) |
| Father's age at childbirthc | 30.9 | (6.1) | 32.3 | (6.2) | 31.4 | (6.1) |
| Mother any psychiatric diagnoses | 1087 | 9.4% | 691 | 7.1% | 3,745 | 7.7% |
| Father any psychiatric diagnoses | 893 | 8.2% | 557 | 6.0% | 2,745 | 5.9% |
a
Any psychiatric diagnoses, but never ADHD or ASD.
b
Baseline characteristics measured at child birth.
c
Mean and (standard deviation).
ADHD, attention-deficit/hyperactivity disorder; ASD, autism spectrum disorder; ns, non-significantly different.