Table 5.

Performance in Model 2 according to EQ-5D quartile in the derivation and validation sets

	Derivation set		Validation set
The lowest quartile
N	224		33
RMSE (% RMSE)	0.137 (11.7)		0.119 (10.2)
MAE (SD)	0.100 (0.093)		0.060 (0.057)
EQ-5D index	Actual	Predict	Actual	Predict
Mean (SD)	0.647 (0.125)	0.726 (0.093)	0.723 (0.070)	0.806 (0.086)
The highest quartile
N	267		37
RMSE (% RMSE)	0.087 (8.7)		0.003 (0.27)
MAE (SD)	0.067 (0.055)		0.060 (0.049)
EQ-5D index	Actual	Predict	Actual	Predict
Mean (SD)	0.960 (0.045)	0.902 (0.057)	1.000(0.000)	0.940 (0.049)