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Table 2 Sample size calculation

From: The Health Of Patients’ Eyes (HOPE) Glaucoma study. The effectiveness of a ‘glaucoma personal record’ for newly diagnosed glaucoma patients: study protocol for a randomised controlled trial

Mean score control group (± SD)

Mean score intervention group (± SD)

Required total sample size, n

7 (3)

8 (3)

400 (200 per group)

7 (3)

9 (3)

122 (61 per group)

7 (3)

10 (3)

58 (29 per group)

  1. SD standard deviation