. Author manuscript; available in PMC: 2025 Aug 25.

Published in final edited form as: Eur Child Adolesc Psychiatry. 2023 Oct 7;33(7):2189–2201. doi: 10.1007/s00787-023-02311-8

Table 2.

Bivariate correlations and descriptive statistics of study variables

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
1. SR CDS	–
2. PR CDS	0.33^***	–
3. TR CDS	0.07	0.24^***	–
4. ADHD-IN	0.29^***	0.44^***	0.44^***	–
5. PR Homework	−0.29^***	−0.50^***	−0.28^***	−0.55^***	–
6. TR Homework	−0.15^*	−0.28^***	−0.63^***	−0.59^***	0.44^***	–
7. Grades	−0.21^***	−0.29^***	−0.42^***	−0.54^***	0.57^***	0.65^***	–
8. WIAT Basic Reading	−0.05	−0.09	−0.05	−0.15^*	0.16^**	0.18^**	0.27^***	–
9. WIAT Num. Operations	−0.18^**	−0.17^**	−0.19^**	−0.33^***	0.38^***	0.36^***	0.54^***	0.4^***	–
10. WIAT Math Fluency	−0.32^***	−0.26^***	−0.17^**	−0.35^***	0.36^***	0.31^***	0.45^***	0.39^***	0.65^***	–
11. SR Daily Motivation	−0.43^***	−0.21^***	−0.24^***	−0.26^***	0.31^***	0.27^***	0.38^***	0.07	0.23^***	0.27^***	–
12. TR Daily Motivation	−0.07	−0.12^*	−0.54^***	−0.51^***	0.4^***	0.65^***	0.59^***	0.14^*	0.33^***	0.23^***	.33^***	–
13. Medication Use	0.22^***	0.31^***	0.24^***	0.27^***	−0.3^***	−0.21^**	−0.24^***	−0.10	−0.18^**	−0.20^**	−0.13^*	−0.16^**	–
14. Sex	0.15^*	−0.05	−0.07	−0.19^**	0.19^**	0.15^*	0.20^***	−0.04	0.04	−0.07	0.13^*	0.21^***	−0.06	–
15. Primary Income	−0.20^***	−0.21^***	−0.15^*	−0.25^***	0.33^***	0.28^***	0.34^***	0.26^***	0.28^***	0.29^***	0.07	0.16^**	−0.22^***	−0.020	–
M	0.86	0.88	0.87	0.97	2.04	5.66	3.12	103.90	102.48	96.21	3.12	2.36	0.39	0.45
SD	0.56	0.89	1.04	0.69	0.56	1.18	0.74	11.78	19.44	15.46	0.50	0.55	0.49	0.49

ADHD attention-deficit/hyperactivity disorder, CDS cognitive disengagement syndrome. HI hyperactivity/impulsivity, IN inattention (average of parent and teacher ratings). PR parent-report, SR adolescent self-report, TR teacher-report

p < .05.

^**

p < .01.

^***

p < .001