Table 8Revised Study Power Based on 76 Participants in Each Arm at End of Study

OutcomeMCIDPower of study to detect MCIDDifference expected based on previous studiesMinimum difference for which study has >80% power
SF-CRQ total1.00.960.73-2.000.45
SF-CRQ dyspnea0.50.780.76-1.060.51
No. of exacerbations22%0.8120%-26%22%
6-Minute Walk Test50 min0.9248-85 min35 min

Abbreviation: MCID, minimal clinically important difference; SF-CRQ, Short-form Chronic Respiratory Disease Questionnaire.

From: Does Working with a Health Coach Help Patients with COPD Improve Their Quality of Life and Breathe Easier?

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Does Working with a Health Coach Help Patients with COPD Improve Their Quality of Life and Breathe Easier? [Internet]
Thom DH, Su G, Hessler D, et al.
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