Fig. 3

SHAP summary plot. (A) Bar charts that rank the importance of 17 indicators identified by SHAP values. (B) Distribution of the impact each feature had on the full model output using SHAP values. RROM: knee flexion angle; RROM1: knee extension angle; RROM2: knee excessive flexion or extension; WTest: timing a 50-foot walk; WYears: work yesrs; RAlign: right femur-tibia angle; BMI: body mass index. E03: In the past 12 months, have you ever had joint pain, stiffness, or soreness that lasted at least 1 month? B15: Stand up from a straight-back seat without armrests? B07: Bend over, squat or kneel? B05: You don’t need to rest when you walk to the first floor? E06: In the past month, have you restricted your daily activities because of knee pain, sore and stiff knees? B03: Walk two miles? B01: Walk a mile? C16: Walk a mile?