Table 2.

The assignment of the variables.

Variables	Assignment situation
Age	< 70 = 1,  ≥ 70 = 2
BMI	< 24.0 = 1, 24.0–27.9 = 2,  ≥ 28.0 = 3
CCI	< 3分 = 1,  ≥ 3分 = 2
Occupational status	Working/farming = 1, retired/unemployed = 2
Residential status	Living with spouse = 1, living with children = 2, living alone/nursing home/other = 3
Understanding of the hazards of prolonged sitting	No = 1, Yes = 2
Preoperative sedentary behaviour [n(%)]	No = 1, Yes = 2
WOMAC	Original value input
GO‐SSS	Original value input
Fatigue	< 5 = 1, ≥ 5 = 2

BMI Body mass index; CCI Charlson Comorbidity Index; Failure Lee’s Fatigue Scale; GO-SSS The Groningen Orthopaedic Social Support Scale; OR Odds Ratio; SE Standard Error; WOMAC The Western Ontario and McMaster Universities Osteoarthritis Index.