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Table 2 Minimum detectable effect size estimates and summary of parameters used in sample size calculations for the main study outcomesa

From: Improving diets and nutrition through an integrated poultry value chain and nutrition intervention (SELEVER) in Burkina Faso: study protocol for a randomized trial

  Women’s dietary MPA Children’s dietary MPA (3–5 years) Children DD (6–24 months) (n. of food groups) Household poultry production Household poultry sales
Communes (n per intervention arm) 15 15 30 30 30
Villages (n per intervention arm) 30 30 60 60 60
Individuals per village (n) 12 12 8.8 15 15
Intra-cluster correlation (level 3) 0.002 0.002 0.001 0.001 0.001
Intra-cluster correlation (level 2) 0.05 0.04 0.05 0.06 0.01
Sample size (per intervention arm) 360 360 526 900 900
Estimated baseline levels 0.26 0.43 3.95 11 1
Standard deviation (baseline) 0.22 0.31 0.97 11 3
Minimum detectable effect size (SD) 0.28 0.27 0.21 0.18 0.15
Minimum detectable effect size (eq. levels) 0.06 0.08 0.20 1.98 0.45
  1. aEstimates based on type I error of 5% (two-sided test) and statistical power of 80%
  2. MPA mean probability of adequacy, DD dietary diversity