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Table 1 Sequence of trial measurements for primary and secondary outcomes*

From: Tai Chi for treating knee osteoarthritis: Designing a long-term follow up randomized controlled trial

VISIT

Baseline

Intervention** (for 12 weeks)

Week 12

Week 24 Follow up

Week 48 Follow up

Time (months)

-1

0

1 – 3

6

12

Primary outcome measure

WOMAC-Pain

X

X

X

X

X

Secondary outcome measures

WOMAC-Physical function

X

 

X

X

X

WOMAC-Stiffness

X

 

X

X

X

Physicians' Global KOA Severity

X

 

X

X

X

Patients' Global KOA Severity

X

 

X

X

X

SF-36 & EQ-5D & CES-D

X

 

X

X

X

Self-efficacy

X

 

X

X

X

Outcome Expectation

X

 

X

X

X

Social Support

X

 

X

X

X

Enjoyment Questionnaire

X

 

X

X

X

Physical Functional Tests***

X

 

X

X

X

Physical Activity Questionnaire

X

 

X

X

X

Joint Proprioception

X

 

X

X

X

Medications

X

X

X

X

X

Adverse Events

 

X

X

X

X

Body Mass Index

X

 

X

X

X

Weekly Update

 

X

   

Knee X-Ray

X

    

Adherence

 

X

X

X

X

Follow-up Questionnaire

   

X

X

  1. * KOA = Knee Osteoarthritis, WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index, SF-36 = Medical Outcome Survey Short-Form 36, EQ-5D = EuroQol self-repot questionnaires, CES-D = Center for Epidemiology Studies Depression index.
  2. ** Randomization to Tai Chi or Attention Control intervention.
  3. *** Physical Function Tests include range of motion, standing balance, 6-minute walk, and chair standing.