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Table 2 Sample size calculations for secondary outcomes

From: Baby-Led Introduction to SolidS (BLISS) study: a randomised controlled trial of a baby-led approach to complementary feeding

  Reference data Source of reference data Difference detecteda Number needed per group
  Mean (SD)    
Energy self-regulation scale 3.9 (0.8) [45] 0.4 63
Plasma ferritin (μg/L) 16.0 (0.6) [65] 5.0 84
  1. a The difference that could be detected with 80 % power and a significance level of 5 %