Table 3. Mean changes within each study group between baseline and week 22 with estimates of intervention effect for Hb, MCV, HCT, and RDW-CV, by anthropometric status or sex 1 . 1 All estimates are from linear mixed models including group (intervention/placebo) and anthropometric status (undernourished/normal weight/ overweight-obese) or sex (boy/girl), and their interaction (group × anthropometric status; or group × sex) as fixed effects, and school as a random effect. Hb haemoglobin, HCT haematocrit, MCV mean corpuscular volume, RDW-CV red blood cell distribution width. 2 Values are the mean change (95% CI) within each group between baseline and week 22. Positive values indicate within-group increases. 3 The intervention effect is the difference in the mean change from baseline to week 22 between the intervention group and the placebo group (Sidak-adjusted 95% CI). Positive values indicate greater positive changes in the intervention group. 4 Undernourished defined as either underweight, stunting, or wasting. Underweight defined as weight-for-age z score < -2; stunting as height-for-age z score < -2; and wasting as BMI-for-age z score < -2. Normal weight defined as BMI-for-age z score ≥ -2 and BMI-for-age z score ≤ 1 in the absence of undernutrition. Overweight/ obesity defined as BMI-for-age z score > 1 in the absence of undernutrition 32