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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Contemp Clin Trials. 2018 Mar 8;68:133–145. doi: 10.1016/j.cct.2018.02.017

Table 2.

Power for effects of a single agent on recurrent depression in VITAL-DEP, over 5 years of follow-up.

RR Total Women Men Non-Hispanic White Minority African-American
2,730 1,856 874 1,777 953 683
0.90 38.2% 30.8% 12.7% 26.7% 16.4% 12.9%
0.85 70.9% 59.6% 23.5% 52.6% 31.6% 24.0%
0.80 92.1% 84.1% 38.5% 77.7% 51.3% 39.2%
0.75 98.9% 96.1% 55.7% 92.9% 70.9% 56.5%
0.70 >99.9% 99.5% 72.2% 98.6% 85.9% 72.9%
0.65 >99.9% >99.9% 85.2% 99.8% 94.7% 85.6%
0.60 >99.9% >99.9% 93.4% >99.9% 98.5% 93.6%

Expected RR;

Expected total number of eligible participants.