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Table 1 Power calculations with base number required of n = 411 in each trial arm**

From: Ringing Up about Breastfeeding: a randomised controlled trial exploring early telephone peer support for breastfeeding (RUBY) – trial protocol

Outcome Standard care Peer support Power to detect specified difference
  % %  
Primary    
Any breast milk at six months 46 56 80
Secondary    
Breast milk only at six months# 35 45 82
  1. **Allows for loss to follow-up and adjusting for clustering in the analysis.
  2. #Breast milk only type of milk.