Table 1.

Summary of all features included in the model training.

Feature category	Features
Patient demographics	Age, sex, BMI, ethnicity, employment status, education status, living alone, marital status, smoking status
Past medical history and medication	Heart attack, heart failure, stroke, asthma, chronic obstructive pulmonary disease, peptic ulcer disease, diabetes, kidney disease, osteoporosis medication
Knee osteoarthritis history	Knee arthroscopy, knee meniscectomy, ligament repair, other knee surgery, arthritis of other joints, knee injury, steroid knee injections, analgesic medication for knee osteoarthritis, arthritis medication
Baseline examination findings	Blood pressure, 20-meter-walk test, five-stands-to-sit test, KLGa,b, CES-Dc baseline
Patient-reported outcome measures	WOMACa,d (Total, Pain score, Stiffness score); SF-12e (Physical components, Mental health component); PASEf

^aSeparate feature for the right and left knee.

^bKLG: Kellgren-Lawrence Grade.

^cCES-D: Center for Epidemiological Studies Depression Scale.

^dWOMAC: Western Ontario and McMaster Universities Osteoarthritis Index.

^eSF-12: 12-item Short Form Health Survey.

^fPASE: Physical Activity Scale for the Elderly.