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Table 2 Change of hemoglobin level after MNP supplementation

From: Effect of micronutrient powder supplementation for two and four months on hemoglobin level of children 6–23 months old in a slum in Dhaka: a community based observational study

Age categories Baseline Endline DID p-value % enhancement by 4 months MNP supplementation
2 months MNP (A) 4 months MNP (B) p-value 2 months MNP (C) 4 months MNP (D) p-value
n Mean (95 % CI) n Mean (95 % CI) n Mean (95 % CI) n Mean (95 % CI)
6–11 months 173 10.64 (10.47, 10.80) 214 10.78 (10.62, 10.95) 0.225 94 10.46 (10.17, 10.74) 142 11.02 (10.87, 11.17) 0.0003 0.41 (0.03, 0.79) 0.037 3.8
12–23 months 266 10.53 (10.36, 10.70) 165 10.78 (10.55, 11.01) 0.079 162 10.77 (10.56, 10.98) 110 11.29 (11.04, 11.53) 0.0016 0.27 (–0.16, 0.70) 0.214 2.5
  1. To assess the effect of the 4 months MNP supplementation we used difference-in-difference (DID) technique is as follows:
  2. Yit = β0 + β1 Time + β2 Group + δ (Time × Group) + β3 Gender + β4 Food security + β5 Stunted + β6 (Vitamin A capsule given) + ε
  3. Where,
  4. Yit = Outcome variable of interest for individual i at time t
  5. Time = (1) if endline and (0) if baseline
  6. Group = (1) if 4 months MNP supplementation and (0) if 2 months MNP supplementation
  7. δ = The effect of the 4 months MNP supplementation
  8. ε = Error term
  9. Effect of 4 months MNP supplementation (TE): [(B − A) − (D − C)] Where, A = baseline mean value for the 4 months MNP supplementation group; B = endline mean value for the 4 months MNP supplementation group; C = baseline mean value for the 2 months MNP supplementation group; D = endline mean value for the 2 months MNP supplementation group. The percent enhancement by 4 months MNP supplementation is calculated as: [(TE/A) × 100]