Prevalence of anaemia and associated factors among preterm infants at six weeks chronological age at Muhimbili National Hospital, Dar es Salaam, Tanzania: a cross-sectional study.

Introduction: preterm infants are vulnerable to several medical complications including anaemia, a significant public health problem with consequences on neurodevelopment. This study looked at the magnitude of anaemia and its associated factors among preterm infants at 6 weeks chronological age in a paediatric clinic of Muhimbili National Hospital (MNH). Methods: this was a hospital based cross-sectional study conducted among preterm infants at 6 weeks chronological age attending follow-up clinic at MNH from October 2019 to March 2020. Parental interviews, medical records reviews and haemoglobin assessment was done during the clinic visits. Logistic regression was used to determine the association between studied factors and anaemia. Results: the proportion of preterm infants with anaemia at 6 weeks chronological age was 38.4% (142/370) with 74% of these infants having moderate anaemia. Morphological types of anaemia were normocytic (56.3%) and microcytic anaemia (4.9%). Two-thirds of preterm infants (62%) were on haematinics supplementation. Moderate preterm born at gestation age 32 to <34 weeks (OR=2.21, 95% CI 1.15-4.25, p=0.017), two or less phlebotomies (OR=2.3; 95% CI 1.23-4.30; P=0.010) and more than two phlebotomies (OR=7.2, 95% CI 3.62-14.16, p≤0.001) were significantly associated with anaemia. Conclusion: the proportion of preterm infants with anaemia at 6 weeks chronological age is high despite two-thirds being on haematinics supplementation. Moderate preterm and multiple phlebotomies significantly contributed to the occurrence of anaemia. Screening preterm infants for anaemia, appropriate management, and close follow-up are recommended to reduce its burden.