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Dear Authors
I am writing to clarify about the primary outcome reported in the study.
Efficacy (e541)
Primary Outcome: On average, participants were given nortriptyline had a WOMAC pain subscale score at week 14 that was 6.2 points lower (95% CI = -0.26 to 12.56)May I ask if the 95% CI reported is corrected as the score of -6.2 is not within the 95% CI.
Competing Interests: None declared.