Table 3.

Mean and standard deviations for the primary outcome measure regarding parental stress at each measurement point.

	Intervention group		Waitlist group
	n	M (SD)	n	M (SD)
Primary outcome measure: Parental stress (PSQ)
- Parent-child relationship problems
Waitlist	–	–	30	10.1 (2.6)
Pretest	37	10.5 (2.3)	30	10.0 (2.8)
Posttest	36	10.8 (2.6)	22	9.6 (2.1)
Follow-up	37	10.2 (2.7)	–	–
- Parenting problems
Waitlist	–	–	30	14.2 (2.9)
Pretest	37	15.1 (3.2)	30	14.2 (3.3)
Posttest	36	14.5 (2.8)	22	13.5 (2.5)
Follow-up	37	14.7 (3.5)	–	–
- Parental role restriction
Waitlist	–	–	30	13.6 (3.5)
Pretest	37	12.5 (2.6)	30	13.2 (4.0)
Posttest	36	12.6 (3.0)	22	13.5 (3.6)
Follow-up	37	11.7 (2.5)	–	–

M, mean; SD, standard deviation; PSQ, parental stress questionnaire.