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Table 2 Sample size required by event rates

From: Baby-OSCAR: Outcome after Selective early treatment for Closure of patent ductus ARteriosus in preterm babies—a statistical analysis plan for short-term outcomes

Control group event rate

Active Rx group event rate

Absolute risk reduction

Relative risk reduction

Approximate total sample size required

60%

47%

13%

22%

620

60%

48%

12%

20%

730

60%

49%

11%

18%

870

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Trials

ISSN: 1745-6215