Table 2.

Standardized effect sizes of intergroup differences in Parenting Stress Index, Fourth Edition subgroup values

Variable		Delayed group (N=51)	Control group (N=27)	P value	Mean difference	Eta-squared (95% CI)
Child domain
	Distractibility/hyperactivity	85.8 (65.7–95.0)	69.2 (17.6–83.4)	0.005	21.2	0.12 (0.03–1.00)
	Adaptability	83.0 (50.4–91.0)	40.1 (12.7–67.3)	<0.001	27.5	0.18 (0.07–1.00)
	Reinforces parent	35.6 (16.1–84.7)	16.1 ( 5.4–35.6)	0.001	24.3	0.12 (0.03–1.00)
	Demandingness	78.2 (56.0–92.1)	34.8 (17.6–56.0)	<0.001	31.7	0.26 (0.13–1.00)
	Mood	59.9 (38.2–85.8)	38.2 (20.1–69.3)	0.040	15.0	0.05 (0.00–1.00)
	Acceptability	85.3 (68.5–96.6)	38.2 (16.4–68.5)	<0.001	37.0	0.34 (0.20–1.00)
	Total score of child domain	83.7 (62.3–94.0)	26.8 (13.1–75.9)	<0.001	35.1	-
Parent domain
	Sense of competence	89.4 (64.4–96.4)	36.3 (12.5–90.8)	<0.001	31.9	0.22 (0.10–1.00)
	Social Isolation	49.2 (24.5–80.5)	31.9 (12.9–73.4)	0.302	7.2	0.01 (0.00–1.00)
	Attachment	49.6 (30.9–83.2)	16.1 ( 9.0–40.2)	0.001	23.0	0.12 (0.03–1.00)
	Parent health	74.9 (39.6–92.9)	44.8 (14.6–82.6)	0.028	17.4	0.06 (0.00–1.00)
	Restriction of role	79.7 (49.4–91.8)	73.9 (28.4–86.5)	0.113	11.9	0.04 (0.00–1.00)
	Depression	79.1 (48.0–92.0)	51.2 (14.2–83.1)	0.026	19.9	0.09 (0.01–1.00)
	Relationship with spouse	65.2 (37.8–86.4)	31.2 (11.7–71.6)	0.010	19.7	0.09 (0.02–1.00)
	Total score of parent domain	76.7 (52.2–93.8)	29.5 (10.2–83.3)	0.006	24.2	-

Values are presented as median (interquartile range).

CI, confidence interval.