Primary outcome
AWD
REGRESSION
The Tobit regression model indicated that there was no statistically significant difference in the AWD at 3 months between the two study groups (NMES + SET + BMT and NMES + BMT 
AWD: absolute walking distance; ITT: intention-to-treat; SET: supervised exercise therapy. Tobit regression model: square root of AWD at 3 months = intercept + square root of AWD (baseline) + Treatment + Type of centre. *The square root transformation of AWD was used for baseline and 3 months measurements. Square root transformation variables satisfy the assumptions of the Tobit model. However, there was a significant increase in the AWD at 3 months (square root; 3.29 units; 95 per cent c.i., 1.77 to 4.82; 