Table 2. Scoring of GPi metrics.

Metric	Range	Score
1. Daily step count	0–10,000 steps*	0–25
2. Gait velocity	0–1.35 m/s**	0–25
3. Mean step length	0–0.75 m	0–25
4. Postural score (while ambulating)	Upright	25
	<5° forward or lateral tilt	20
	5°–15° forward or lateral tilt	15
	>15° forward or lateral tilt	10
	Requiring a walking aids (e.g., walking frame or walking stick)	5
	Unable to ambulate	0
GPi total		100

*, beyond 10,000 steps, there is no additional points awarded. **, walking velocity of 1.35 m/s is considered the upper limit of normal for health adults. GPi, Gait Posture index.