The source of variation for number of steps taken again lay mainly between preoperative and postoperative values (p=0·003) rather than between the three trials (p=0·981) and there was no interaction (p=0·959).
The source of variation for number of steps taken again lay mainly between preoperative and postoperative values (p=0·003) rather than between the three trials (p=0·981) and there was no interaction (p=0·959).