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Table 10 Height-for-age z-scores (HAZ): standardised detectable differences and equivalent levels for different designs

From: Evaluation of alternative school feeding models on nutrition, education, agriculture and other social outcomes in Ghana: rationale, randomised design and baseline data

  Children under 5 years (in SDs) Equivalent level
30 clusters 0.35 0.55
60 clusters 0.25 0.39
120 clusters 0.17 0.27
  1. SD standard deviation