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Table 4 Summary of measurements to be taken

From: Better Knee, Better Me™: effectiveness of two scalable health care interventions supporting self-management for knee osteoarthritis – protocol for a randomized controlled trial

Domain Data collection instrument Time points
Baseline 6 M 12 M
Descriptive data
 Age, gender, height, body mass index     
 Duration of knee OA symptoms     
 Previous treatments and surgery     
 Problems in other joints     
 Medical history     
 Expectation of treatment outcome 5-point ordinal scale   
Primary outcome measures
 Average knee pain in past week 11-point NRS
 Physical function in past 48 h WOMAC physical function subscale
Secondary outcome measures
 Weight Self-reported
 Physical activity IPEQ-W questionnaire
 Health-related quality of life AQoL-8D questionnaire
 Perceived change since baseline Overall change, 7-point ordinal scale  
  Change in pain, 7-point ordinal scale  
  Change in function, 7-point ordinal scale  
  Change in physical activity, 7-point ordinal scale  
 Satisfaction with care 7-point ordinal scale  
 Appointment with orthopaedic surgeon Yes/No
 Depression, anxiety, and stress DASS-21
 Surgery performed Self-reported TKJR and arthroscopy  
 Willingness to undergo surgery 5-point ordinal scale
Other measures
 Health economic data Quality adjusted life years
Self-reported medication use
Self-reported use of health services/co-interventions
Cost-effectiveness ratio  
Work productivity (WHO HPQ Short Form)
 Adherence Number of consultations with physiotherapista    
Number of consultations with dietitianb    
Duration of consultations with physiotherapista    
Duration of consultations with dietitianb    
Self-rated adherence to strengthening exercisea/ physical activitya/weight managementb, 11-point NRS    
 Perceived usefulness Times accessed website, 5-point ordinal scale  
Usefulness of website, 11-point NRS    
Usefulness of physiotherapy consultationsa 11-point NRS    
Usefulness of dietitian consultationsb 11-point NRS    
Usefulness of educational resourcesa 11-point NRS    
Usefulness of Fitbita 11-point NRS    
Usefulness of ketogenic dietb 11-point NRS    
Usefulness of strengthening exercise programa 11-point NRS    
Usefulness of physical activity plana 11-point NRS    
Video software ease of usea 11-point NRS    
 Harms Adverse events  
 Determinants Self-efficacy for symptom control (ASES)
Self-efficacy for eating (WELQ)
Attitudes towards self-management (PAM-13)
Treatment beliefs about arthroplasty (TOA)
Fear of movement (BFMS)
 Long-term surgical rates Number who have had arthroscopy/arthroplasty   24 months and 60 months  
  1. NRS Numeric rating scale, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, IPEQ-W Incidental and Planned Exercise Questionnaire, AQoL-8D Assessment of Quality of Life Instrument, DASS Depression, Anxiety, and Stress Scale, TKJR Total knee joint replacement, WHO HPQ World Health Organization Health and Work Performance Questionnaire, ASES Arthritis Self-efficacy Scale, WELQ Weight Efficacy Lifestyle Questionnaire, PAM Patient Activation Measure, TOA Treatment beliefs in knee and hip OA – arthroplasty subscale, BFMS Brief Fear of Movement Scale for osteoarthritis
  2. ameasured in Exercise and Exercise plus weight management groups only
  3. bmeasured in Exercise plus weight management group only