Table 2.

Final linear mixed-effects model results for 128 patients with EQ-5D-Y and PedsQL data

Covariate	Coefficients for EQ-5D-Y	Coefficients for PedsQL	p value
28-day frequency of SFDs	0.550	0.274	< 0.001/< 0.01
Study 2	1.086	0.334	> 0.1/> 0.05
Age 6–11 years	6.587	− 7.392	> 0.05/< 0.001
Age > 12 years	6.085	− 8.512	> 0.10/< 0.001
Motor impairments—ataxia (relative to none)	− 5.654	– 2.962	< 0.05/< 0.05
Motor impairments—severe (relative to none)	− 14.019	− 9.065	> 0.05/> 0.1

EQ-5D-Y coefficients refer to a 0–100 scale. All utility values predicted using these coefficients were divided by 100 before the predicted relationship was estimated (shown in Fig. 1)