Table 2.

: Hazard Ratios (HR) for the Association Between Hospital diagnosed Hyperkinetic Disorders (HKD), Attention Deficit Hyperactivity Disorder (ADHD) Medication and Early Folic Acid and Multivitamin Supplementation (from −4 weeks to 8 weeks of gestation), in the DNBC ^¥

	Exp. Cases/Total Exp.	Unexp. cases/Total Unexp.	cHR	95% Confidence		aHR*	95% Confidence
Folic acid users
HKD Diagnosis	20/2661	164/11916	0.59	0.37	0.95	0.87	0.54	1.41
ADHD Medication	39/2661	268/11916	0.70	0.50	0.97	0.96	0.68	1.37
Multivitamin users
HKD Diagnosis	55/7901	164/11916	0.53	0.39	0.73	0.70	0.52	0.96
ADHD Medication	107/7901	268/11916	0.63	0.50	0.79	0.78	0.62	0.98

^¥Consumed supplements in at least 10 of the 12 weeks, some folic acid users may have used multivitamins, multivitamin category excludes folic acid users

^*Adjusted for maternal age (continuously); household socio-economic status (low, medium, high); maternal smoking (never, ever); and alcohol consumption during pregnancy (never, 0–4 glasses per week, more than 4 glasses per week), maternal pre-pregnancy body mass index (0-<18.5, 18.5-<25, ≥26) birth year (2001, 2002, 2003), offspring sex (male, female) reference categories have been italicized.