Table 7.

Regression analyses for one or two bolt-on items

		One additional item for the bolt-on				Two additional items for the bolt-on
	EQ-5D-Y	CA	CO	ME	SP	CA + CO	CA + ME	CA + SP	CO + ME	CO + SP	ME + SP
$R^2$	0.3962	0.4075	0.4154	0.4159	0.4019	0.4288	0.4276	0.4181	0.4386	0.4283	0.4238
$R_{\mathit{adj}}^2$	0.3663	0.3716	0.3798	0.3802	0.3655	0.3876	0.3861	0.3761	0.3977	0.3870	0.3818
AIC	1752.1	1736.9	1726.0	1719.4	1728.0	1718.0	1712.1	1719.1	1700.0	1714.9	1702.6

Bold values are the lowest value of R², R²_adj or AIC

CA cognitive abilities, CO concentration, ME memory, SP school performance