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Table 1 Outcome measures of secondary endpoints at different time points for participants

From: Acceptability and feasibility of a community-based strength, balance, and Tai Chi rehabilitation program in improving physical function and balance of patients after total knee arthroplasty: study protocol for a pilot randomized controlled trial

Types of measure Assessments Measurement time
  Pre-op (Baseline) Postop 6 wk Postop 12 wk Postop 24 wk Postop 52 wk
Subjective assessments
 Sociodemographic characteristics Age, sex, weight, height, dominant leg, marital status, number of people in the household, smoking habit, educational level, work status (number of working hours per week), occupation, alcohol/smoking status, history of trips/ falls, elevator landing or non-elevator landing flat x     
 Comorbidities List of diseases: respiratory disease, hypertension, cardiovascular disease, eye problems, hallux valgus, previous hip or knee arthroplasty x     
 Pain 11-point numeric pain rating scale [28] x x x x x
 Physical function Chinese version of Knee Injury and Osteoarthritis Outcome Score [29] x x x x x
 Depression Chinese version geriatric depression scale [30] x x x x x
 Physical activity Physical Activity Scale for the Elderly (Chinese version) [31] x x x x x
 Global impression of change in the intervention/ usual care Self-perceived global changes     x x
 Fear of falling Falls Efficacy Scale [32] x x x x x
Physical assessments
 Range of motion Lower limb joint range of motion by goniometer x x x x x
 Balance Brief-Balance Evaluation System test [33] x x x x x
 Static and dynamic stability Functional tests using two wearable inertial sensors during tandem stance, a timed up-and-go test, and a 6-min walk test. x x x x x
 Physical activity over 3 days Activity monitoring for 3 days in a week x   x x x
  1. Note: The asymptomatic controls will only undergo follow-ups at 12-week and 52-week after the baseline
  2. TKA total knee arthroplasty, mth month, post-op post-operation, pre-op pre-operation, wk = week