Mapping of the EQ-5D index from clinical outcome measures and demographic variables in patients with coronary heart disease

Table 6 Measures of prediction from multiple variable modelling in the estimation dataset

Model	Variables in model (in addition to age, sex and disease stage)	RMSE	MAE	Adjusted R²
1	---	0.288	0.209	0.04
2	ETT	0.226	0.169	0.29
3	CCS	0.249	0.185	0.28
4	SAQ ECS	0.179	0.130	0.43
5	SAQ ASS	0.264	0.193	0.13
6	SAQ ASS with ACRE data excluded	0.228	0.163	0.15
7	SAQ AFS	0.243	0.175	0.23
8	SAQ AFS with ACRE data excluded	0.204	0.148	0.32
9	SAQ DPS	0.199	0.144	0.35
10	SAQ TSS	0.230	0.165	0.13
11	SAQ ECS, AFS, DPS	0.170	0.122	0.48
12	SAQ ECS, ASS, AFS, DPS, TSS	0.169	0.121	0.49

Key: RMSE = root mean square error, MAE = mean absolute error, ETT = exercise treadmill time, CCS = Canadian Cardiovascular Society Angina Classification, SAQ = Seattle Angina Questionnaire, ECS = exertional capacity scale, ASS = anginal stability scale, AFS = anginal frequency scale, DPS = disease perception scale, TSS = treatment satisfaction scale

ISSN: 1477-7525