Table 2.

Convergent validity: Spearman’s ρ correlation between preference-weighted instruments and other caregiver measures for caregivers of children with autism spectrum disorder, n = 224^a

Caregiver measure	Caregiver health-related quality of life measure
	SF-6D index	EQ-5D-3L index
SF-6D index		0.617***
EQ-5D-3L index	0.617***
CarerQol-7D	0.569***	0.541***
CES-D	−  0.742***	− 0.501***

Spearman’s ρ: 0.10–0.29 = weak, 0.30–0.49 = moderate, and > 0.50 = strong. Higher scores on the CES-D indicate worse problems; higher scores on the CarerQol-7D indicate better care-related quality of life

CarerQol-7D Care-related Quality of Life instrument, CES-D Center for Epidemiologic Studies Depression Scale, EQ-5D-3L three-level EuroQoL-5 Dimension, SF-6D Short Form-6 Dimension

*p < 0.05, **p < 0.01, ***p < 0.001

^aSpearman’s ρ correlations included the maximum number of observations per correlation, ranging from 197 to 213