Table 2.

Descriptive Statistics of variables of interest.

	n	Mean	SD	range
Chronological age at time of ADHD measurement	105	12.4	3.4	6.2–18.9
KBIT-2 Composite IQ score at time of ADHD measurement	105	48.7	10.1	40–86
KBIT-2 Composite (age-corrected) at time of ADHD measurement	105	96.3	53	0–236
Conners-3
Inattention calculated raw score	105	13.1	6.5	0–29
Inattention T-score	105	65.3	13.1	38–90
Hyperactivity calculated raw score	105	11.4	8.6	0–36
Hyperactivity T-score	105	59.2	12.3	37–90
Global Index calculated raw score	105	8.3	5.4	0–23
Global Index T-score	105	59.1	12.2	36–90
Positive impression Index	105	0.65	0.9	0–4
Negative impression Index	105	0.37	0.7	0–3
Gestational age (weeks)	105	38.2	1.3	35–41
Maternal age at childbirth	101	35.7	4.6	25–47
Paternal age at childbirth	101	37.1	5.6	26–53