Impact of Genetic Hemoglobin (Hb) Disorders on the Effectiveness of Micronutrient Sprinkles in Reducing Anemia in Young Children in Rural Cambodia.

ABSTRACT

Objectives: To evaluate the impact of genetic Hb disorders on the effectiveness of 6 months of daily micronutrient Sprinkles for infants age 6-12 months on anemia. Methods: As part of a randomized controlled effectiveness trial, subjects were screened for genetic Hb disorders at aged 18 months on whole blood using the SEBIA MINICAP analyser, HEMOGLOBIN (E) program, and IC α THAL test to detect major Hb variants and α-thalassemia. Anemia (Hb < 110 g/L) was measured at baseline (age 6 mo), endline (age 12 mo), and at two follow up points (age 18 mo and 24 mo) for children with and without genetic Hb disorders. Results: Half of all children had a genetic haemoglobin disorder (at least 15 types). At baseline, overall prevalence of anemia for children with normal Hb was 81% versus 88% for those with any genetic Hb disorder. At endline, anemia prevalence for the intervention group with normal Hb vs genetic Hb disorder was 60.2% versus 72.0% (P = 0.02) and for the control group 81.1% versus 88.8% (P = 0.03), respectively. At further follow-up, anemia decreased in both the control and intervention groups. However those with any genetic Hb disorder remained more anemic with varying levels of anemia according to the disorder type. Conclusions: Sprinkles had a similar proportional effect regardless of overall genetic Hb status indicating that children with genetic Hb disorders can effectively utilize iron and micronutrients to reduce anemia. Sprinkles can be effective in populations with a high prevalence of genetic Hb disorders.