Table 1 Baseline characteristics
Baseline characteristic | Type | Levels or scale |
|---|---|---|
Gender | Categorical | Male; Female |
Age | Categorical | 55–64 years; 65–74 years; 75 years or more |
Age | Continuous | Years |
Fallen in the last year | Categorical | Yes; No |
Number of falls in last year | Continuous | NA |
Previous lower limb surgery | Categorical | Yes; No |
Charnley ABC classification | Categorical | Single knee arthroplasty; Both knees affected; Multiple joint disease (or other disability) |
Self-reported current mobility (stairs) | Categorical | Normal; One step at a time; Down with rail; Up and down with rail; Unable down; Unable |
Self-reported current mobility (support) | Categorical | None; Stick outdoors; Stick always; 2 sticks; 2 crutches; Walking frame |
Body mass index | Continuous | kg/m2 |