Skip to main content

Table 2 Statistical power estimates for differing drop-out rates and ICCs

From: The Reflective Fostering Programme—improving the wellbeing of children in care through a group intervention for foster carers: a randomised controlled trial

  Drop-out 15% 20% 25% 30%
  Assumed ICC 0.05 0.10 0.05 0.10 0.05 0.10 0.05 0.10
  770 93% 88% 91% 86% 90% 85% 88% 82%
Total 720 91% 86% 90% 85% 88% 83% 83% 77%
Randomised
  620 88% 83% 86% 81% 84% 79% 87% 76%
  500 82% 77% 79% 75% 78% 73% 82% 71%