QOL	quality of life
OA	osteoarthritis
SF-36	the Medical Outcome Study 36-Item Short-Form Health Survey
SD	standard deviation
VAS	visual analog scale
PF	physical function
BR	body role/role limitations due to physical health problems
BP	body pain
GH	general health problems
VT	vitality
SF	social function
ES	emotional status/role limitations due to emotional health problems
MH	general mental health problems
B	regression coefficient
CI	confidence intervals
β	standardized coefficients
RG	reference group