Table 1 Classification criteria of safety level.
Level | Value range | Explanation |
|---|---|---|
Level 0 | \(\:0.38\le\:{x}_{7}\le\:0.50\) | Safety: normal activities, natural posture |
Level 1 | \(\:0.51\le\:{x}_{7}\le\:0.56\) | Low risk: minor falls or atypical postures |
Level 2 | \(\:0.57\le\:{x}_{7}\le\:0.61\) | Medium-high risk: posture distortion or occlusion |
Level 3 | \(\:0.62\le\:{x}_{7}\le\:0.74\) | High risk: obvious falls, accompanied by occlusion and crowded environment |
