Table 3.

Rotated (promax)¹ tetrachoric factor analysis (standardized regression coefficients) for hyperactivity-impulsivity symptoms based on CIDI symptom reports in adolescent–parent pairs where both respondents were classified as being in the HD spectrum (n = 1512)

		Factor 1	Factor 2	Factor 3	Factor 4
I.	Youth reports
	Fidgets or squirms	0 .11	0 .74	0 .11	−0.05
	Leaves seat	0.05	0.65	0.27	−0.05
	Runs about or climbs	0.16	0.73	0.05	−0.01
	Difficulty playing quietly	−0.21	0.87	−0.09	0.09
	On the go or driven by a motor	0.04	0.77	−0.09	−0.00
	Talks excessively	−0.09	0.18	0.72	0.07
	Blurts out answers	−0.10	−0.02	0.84	0.16
	Difficulty waiting turn	0.08	0.15	0.74	−0.16
	Interrupts or intrudes on others	0.03	−0.15	0.94	−0.01
II.	Parent reports
	Fidgets or squirms	0.95	−0.09	0.09	−0.13
	Leaves seat	0.81	0.13	−0.13	0.11
	Runs about or climbs	0.95	−0.02	0.00	0.01
	Difficulty playing quietly	0.86	−0.00	−0.11	0.04
	On the go or driven by a motor	0.82	0.06	0.00	−0.03
	Talks excessively	−0.10	0.08	−0.03	0.93
	Blurts out answers	0.16	−0.05	0.08	0.83
	Difficulty waiting turn	0.67	0.03	0.08	0.29
	Interrupts or intrudes on others	0.34	0.07	−0.01	0.63

¹Correlations among factors: F1–F2: 0.31; F1–F3: 0.12; F1–F4: 0.46, F2–F3: 0.39, F2–F4: 0.16, F3–F4: 0.19.