Table 3.

Predictive value of core ADHD symptoms and co-occurring problems on clinical ADHD diagnosis (based on the National Patient Register) in males and females

Characteristica	Males		Females		Interaction (sex-by-symptom)
	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Inattention	1.67 (1.61, 1.74)	<.001	1.73 (1.63, 1.84)	<.001	1.02 (0.96, 1.10)	.43
Hyperactivity/impulsivity	1.55 (1.49, 1.61)	<.001	1.68 (1.58, 1.77)	<.001	1.08 (1.01, 1.15)	.03
Conduct problems	2.79 (2.41, 3.25)	<.001	4.09 (3.20, 5.23)	<.001	1.43 (1.09, 1.87)	.01
Learning problems	2.53 (2.28, 2.81)	<.001	2.87 (2.45, 3.35)	<.001	1.11 (0.93, 1.33)	.25

Bold data signify statistical significance of the tests

All models were adjusted for familial clustering, year of birth, and SES

OR Odds Ratio (95% confidence interval)

^aData were missing on some variables; all available data were used in analysis