BMC Musculoskeletal Disorders

Table 4 OLS models on the predictive effect of ASA class on HRQoL score 1 year postoperatively (n = 69,290)

From: Predictive ability of the American Society of Anaesthesiologists physical status classification system on health-related quality of life of patients after total hip replacement: comparisons across eight EQ-5D-3L value sets

Model components	Model estimates
	Patient-reported EQ VAS		Swedish VAS		German VAS		Danish VAS^b		UK VAS^b
	β	RSE^a	β	RSE^a	β	RSE^a	β	RSE^a	β	RSE^a
Intercept	0.824^*	0.0013	0.795^*	0.0010	0.773^*	0.0011	0.790^*	0.0012	0.838^*	0.0014
ASA class II	−0.062^*	0.0016	−0.044^*	0.0012	−0.050^*	0.0014	−0.076^*	0.0015	−0.060^*	0.0017
ASA class III	−0.140^*	0.0025	−0.104^*	0.0020	−0.112^*	0.0021	−0.165^*	0.0024	−0.132^*	0.0026
ASA Class IV	−0.175^*	0.0148	−0.138^*	0.0119	− 0.145^*	0.0121	−0.213^*	0.0142	−0.170^*	0.0150
R²		0.0474		0.0430		0.0423		0.0444		0.0402
MAE		0.153		0.122		0.138		0.207		0.162
Normalized MAE		0.153		0.170		0.194		0.178		0.151
RMSE		0.194		0.151		0.165		0.237		0.200
Normalized RMSE		0.194		0.211		0.232		0.203		0.186
Spearman Rank correlation		0.288		0.275		0.205		0.236		0.177
Model components	Swedish TTO		German TTO^b		Danish TTO^b		UK TTO^b
Model components	β	RSE^a	β	RSE^a	β	RSE^a	β	RSE^a
Intercept	0.909^*	0.0007	0.903^*	0.0011	0.870^*	0.0012	0.848^*	0.0015
ASA class II	−0.030^*	0.0009	−0.046^*	0.0014	−0.051^*	0.0015	−0.062^*	0.0019
ASA class III	−0.073^*	0.0014	−0.105^*	0.0024	−0.115^*	0.0024	−0.141^*	0.0031
ASA Class IV	− 0.100^*	0.0085	− 0.133^*	0.0152	− 0.147^*	0.0142	−0.181^*	0.0186
R²		0.0431		0.0318		0.0367		0.0348
MAE		0.084		0.121		0.134		0.164
Normalized MAE		0.133		0.101		0.083		0.111
RMSE		0.106		0.179		0.182		0.229
Normalized RMSE		0.169		0.148		0.112		0.247
Spearman Rank correlation		0.164		0.124		0.156		0.187

MAE mean absolute error; RMSE root mean square error, RSE robust standard error
^*P < 0.001
^aHeteroskedasticity-consistent standard error;
^bHypothetical perspective

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ISSN: 1471-2474

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