AD	Anxiety and depression
ANOVA	Analysis of variance
BIC	Bayesian Information Criterion
CI	Confidence interval
HRQoL	Health-related quality of life
HTA	Health technology assessment
MO	Mobility
OLS	Ordinary least squares
PD	Pain and discomfort
QALY	Quality-adjusted life year
SC	Self care
SD	Standard deviation
SES	Socioeconomic status
TTO	Time trade off
UA	Usual activity
VAS	Visual analogue scale