Gait + Balance Coach Report

Coach Summary

• The selected walking window contained 4 left and 4 right steps, with 4 left and 3 right completed strides.
• Initial-contact alternation and stride structure provided good engineering evidence for this window.
• Step-time asymmetry was 4.3%, within the current engineering monitor band.
• Stance-time difference was 2.2 percentage points, within the current engineering monitor band.
• The window did not contain enough complete strides on both sides for fully reportable variability analysis.
• Trunk–pelvis relative orientation excursion was 15.8° (MILD under the current engineering bands).

Capture and Evidence Quality

• Window: 4.67 s @ 30.00 fps
• Accepted gait events: 16
• Rejected non-gait events: 28
• Initial contacts: L 5, R 4
• Toe-offs: L 4, R 3
• Completed steps: L 4, R 4
• Completed strides: L 4, R 3
• Evidence grade: GOOD
• Initial-contact alternation: 100.0%
• Valid stride structure: 100.0%
• Fallback-event fraction: 12.5%

Step Timing and Left/Right Symmetry

• Left mean step time: 0.567 s (17.00 frames; n=4)
• Right mean step time: 0.592 s (17.75 frames; n=4)
• Signed left–right step-time difference: -4.32%
• Absolute step-time asymmetry: 4.32%
• Status: Within the current engineering monitor band (< 5.0%).

Stride Timing and Variability

• Left mean stride time: 1.158 s (34.75 frames; n=4)
• Right mean stride time: 1.133 s (34.00 frames; n=3)
• Left stride-time variability: 4.32% CV — exploratory only; fewer than 5 strides (n=4).
• Right stride-time variability: 0.00% CV — exploratory only; fewer than 5 strides (n=3).
• Status: Not reportable for this window

Stance and Swing Timing

• Left stance proportion: 54.63% (n=4)
• Right stance proportion: 56.86% (n=3)
• Left swing proportion: 45.37%
• Right swing proportion: 43.14%
• Absolute stance-time difference: 2.23 percentage points
• Status: Within the current engineering monitor band (< 5.0 percentage points).
• This is a kinematic initial-contact-to-toe-off timing proxy, not a force, pressure, loading, or plantar-pressure measure.

Trunk–Pelvis Movement Quality

• Trunk–pelvis relative orientation excursion: 15.81°
• Reference joints: Hips → Chest
• Valid stride windows: 7
• Status: MILD
• This wrap-safe thorax-relative-to-pelvis descriptor is a movement-quality proxy, not a clinical balance diagnosis.

Current Rule Findings

• MILD: Thorax movement relative to the pelvis was elevated across stride windows. This wrap-safe orientation descriptor is a movement-quality proxy, not a clinical balance diagnosis. [trunk_sway_proxy]
• INFO: Robust baseline-relative z-scores were not calculated because a repeated, protocol-matched baseline distribution was not available. [baseline_not_available]

Selected Baseline Comparison

• trunk forward/back displacement proxy:

• trunk side-to-side displacement proxy:

• head forward/back displacement proxy:

• head side-to-side displacement proxy:

• left foot clearance proxy:

• right foot clearance proxy:

Practical Review Priorities

• Review thorax–pelvis movement across the same stride windows and confirm whether it is repeatable.

Interpretation Boundary

• These are descriptive movement-quality and selected-baseline differences from recorded motion data.
• They are not a diagnosis, fall-risk detector, neurological screen, or clinical impairment classification.
• Current thresholds are transparent engineering starting bands pending external biomechanical validation.