Mapping of the Insomnia Severity Index and other sleep measures to EuroQol EQ-5D health state utilities

Table 5 Assessing model predictions

		N	Model I		Model II		Model III		Model IV
			MSE	MAE	MSE	MAE	MSE	MAE	MSE	MAE
Estimation Sample	Full index	1421 (100%)	0.024	0.109	0.025	0.110	0.026	0.112	0.024	0.110
	< 0.2	10 (0.68%)	N/A	0.545	0.375	0.566	0.424	0.567	N/A	0.526
	0.2-0.4	53 (3.76%)	0.184	0.350	0.146	0.366	0.155	0.377	0.192	0.392
	0.4-0.6	164 (11.57%)	0.070	0.232	0.066	0.235	0.068	0.241	0.072	0.250
	0.6-0.8	329 (23.15%)	0.008	0.066	0.007	0.063	0.007	0.064	0.005	0.057
	0.8-1.0	865 (60.85%)	0.013	0.083	0.013	0.084	0.014	0.085	0.013	0.087
Validation Sample	Full index	1421 (100%)	0.025	0.110	0.024	0.110	0.025	0.111	0.023	0.108
	< 0.2	10 (0.73%)	N/A	0.538	0.351	0.555	0.389	0.547	N/A	0.502
	0.2-0.4	53 (3.70%)	0.209	0.373	0.157	0.381	0.165	0.388	0.207	0.407
	0.4-0.6	163 (11.44%)	0.071	0.233	0.064	0.234	0.067	0.235	0.071	0.246
	0.6-0.8	326 (22.95%)	0.008	0.069	0.007	0.061	0.007	0.064	0.006	0.061
	0.8-1.0	869 (61.18%)	0.013	0.083	0.013	0.084	0.014	0.085	0.013	0.087

-MSE = Mean square error.
-N/A = Estimates were not available due to the small sample size
-MAE = Mean absolute error
- Note: For model specifications please refer to Table 1
-Sample size for both the estimation and validation sample was randomly drawn (50%) from the total qualified participants (N = 2,842).

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