Table 7.
Sample size and actual statistical power in the correlation analysis of biweekly app survey.
| Survey | Days before and after the paper survey and scores | ||||||||||
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Same day | 3 days | 7 days | 14 days | |||||||
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Sample size | Actual power | Sample size | Actual power | Sample size | Actual power | Sample size | Actual power | |||
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| PHQ-9a sum | 36 | .951 | 26 | .955 | 28 | .954 | 44 | .951 | |||
| PHQ-10b | 15 | .960 | 58 | .952 | 60 | .952 | 130 | .950 | |||
aPHQ-9: Patient Health Questionnaire–9.
bPHQ-10: Patient Health Questionnaire Q10.