Faecal regenerating 1B protein concentration is not associated with child growth in rural Malawi

AIM: This study was designed to determine whether faecal regenerating 1B protein (REG1B) concentration is associated with physical growth among 6–30‐month‐old children in rural Malawi. METHODS: This was a secondary analysis from a randomised controlled trial in rural Malawi in which we followed‐up 790 live‐born infants from birth to 30 months of age. We collected anthropometric data at the age of 6, 12, 18, 24 and 30 months. We measured faecal REG1B concentration by enzyme‐linked immunosorbent assay (ELISA) technique using stool samples collected at 6, 18 and 30 months of age. We assessed the association between faecal REG1B concentration and children's physical growth using linear regression and longitudinal data analysis. RESULTS: Of 790 live‐born infants enrolled, 694 (87%) with at least one faecal REG1B concentration measurement were included in the analysis. Faecal REG1B concentration was not associated with the children's concurrent length‐for‐age z‐score (LAZ), weight‐for‐age z‐score (WAZ), weight‐for‐length z‐score (WLZ) and mid‐upper arm circumference‐for‐age z‐score (MUACZ) at any time point (P > 0.05), nor with a change in their anthropometric indices in the subsequent 6‐month period (P > 0.05). CONCLUSIONS: Faecal REG1B concentration is not associated with LAZ, WAZ, WLZ and MUACZ among 6–30‐month‐old infants and children in rural Malawi.