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

Teni, Fitsum Sebsibe; Burström, Kristina; Berg, Jenny; Leidl, Reiner; Rolfson, Ola

doi:10.1186/s12891-020-03399-8

Table 5 Adjusted OLS models on the predictive effects of ASA class on HRQoL score based on the value sets 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	Value sets/EQ VAS
Model components	Patient-reported EQ VAS	Swedish VAS	German VAS	Danish VAS^h	UK VAS^h	Swedish TTO	German TTO^h	Danish TTO^h	UK TTO^h
Intercept	0.860^***	0.834^***	0.834^***	0.880^***	0.903^***	0.932^***	0.952^***	0.917^***	0.907^***
ASA class ^a
Class II	−0.028^***	−0.015^***	− 0.015^***	− 0.024^***	− 0.020^***	− 0.010^***	− 0.015^***	− 0.018^***	− 0.022^***
Class III	− 0.066^***	− 0.040^***	− 0.037^***	−0.054^***	− 0.047^***	−0.029^***	− 0.038^***	−0.043^***	− 0.054^***
Class IV	−0.092^***	− 0.066^***	−0.060^***	− 0.087^***	−0.074^***	− 0.051^***	−0.060^***	− 0.068^***	−0.084^***
Age group ^b
50–59	0.011^***	0.010^***	0.006^**	0.012^**	0.009^**	0.007^***	0.004	0.010^***	0.010^**
60–69	0.029^***	0.021^***	0.015^***	0.019^***	0.019^***	0.016^***	0.013^***	0.022^***	0.026^***
70–79	0.021^***	0.020^***	0.013^***	0.013^***	0.017^***	0.016^***	0.013^***	0.022^***	0.026^***
80–98	−0.006	0.002	−0.004	−0.020^***	− 0.005	0.002	− 0.001	0.005	0.006^***
Sex ^c
Female	−0.010^***	−0.018^***	− 0.020^***	−0.030^***	− 0.024^***	−0.012^***	− 0.017^***	−0.022^***	− 0.025^***
BMI category ^d
Normal weight	0.025^***	0.024^***	0.021^***	0.034^***	0.029^***	0.018^***	0.022^***	0.027^***	0.032^***
Overweight	0.026^***	0.024^***	0.020^***	0.033^***	0.028^***	0.017^***	0.020^**	0.026^***	0.032^***
Obese class I	0.018^*	0.017^**	0.012^*	0.021^**	0.019^**	0.012^**	0.011	0.019^**	0.022^**
Obese class II	0.009	0.012^*	0.008	0.014	0.013	0.008^*	0.003	0.014^*	0.015
Obese class III	−0.007	−0.005	−0.007	−0.003	−0.003	−0.005	−0.011	− 0.003	−0.005
Laterality ^e
Left	−0.001	−0.002	− 0.002	−0.002	− 0.001	−0.001	0.0001	−0.001	− 0.0006
Charnley class ^f
Class B	− 0.063^***	−0.053^***	− 0.073^***	−0.126^***	− 0.097^***	−0.033^***	− 0.062^***	−0.075^***	− 0.091^***
Class C	−0.157^***	− 0.146^***	−0.173^***	− 0.256^***	−0.199^***	− 0.098^***	−0.149^***	− 0.166^***	−0.202^***
Hip pain level ^g
Very mild	−0.085^***	−0.073^***	− 0.093^***	−0.143^***	− 0.106^***	−0.048^***	− 0.063^***	−0.084^***	− 0.100^***
Mild	−0.167^***	− 0.138^***	−0.150^***	− 0.194^***	−0.156^***	− 0.096^***	−0.120^***	− 0.138^***	−0.171^***
Moderate	−0.285^***	−0.257^***	− 0.259^***	−0.278^***	− 0.319^***	−0.184^***	− 0.366^***	−0.342^***	− 0.447^***
Severe	−0.372^***	− 0.331^***	−0.317^***	− 0.346^***	−0.414^***	− 0.254^***	−0.498^***	− 0.511^***	−0.621^***
Adjusted R²	0.360	0.460	0.503	0.486	0.455	0.441	0.384	0.431	0.415
MAE	0.121	0.083	0.092	0.143	0.117	0.058	0.088	0.100	0.123
Normalized MAE	0.121	0.116	0.129	0.123	0.109	0.092	0.073	0.062	0.077
RMSE	0.159	0.114	0.119	0.174	0.151	0.081	0.143	0.140	0.178
Normalized RMSE	0.159	0.159	0.167	0.149	0.140	0.129	0.118	0.086	0.112
Spearman’s Rank correlation	0.598	0.683	0.701	0.696	0.692	0.688	0.687	0.679	0.682

Reference group: ^a class I;^b < 50; ^cMale; ^d underweight; ^e right; ^f class A; ^g none; ^hhypothetical perspective; ^*P-value< 0.05; ^**P-value< 0.01;^***P-value< 0.001
The smallest non-statistically significant p-value = 0.059; MAE mean absolute error, RMSE root mean square error

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