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Implications for quantifying early life growth trajectories of term‐born infants using INTERGROWTH‐21st newborn size standards at birth in conjunction with World Health Organization child growth standards in the postnatal period
Author(s) -
Perumal Nandita,
Ohuma Eric O.,
Prentice Andrew M.,
Shah Prakesh S.,
Al Mahmud Abdullah,
Moore Sophie E.,
Roth Daniel E.
Publication year - 2022
Publication title -
paediatric and perinatal epidemiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.667
H-Index - 88
eISSN - 1365-3016
pISSN - 0269-5022
DOI - 10.1111/ppe.12880
Subject(s) - medicine , anthropometry , birth weight , pediatrics , demography , gestational age , malnutrition , underweight , head circumference , standard score , pregnancy , obesity , overweight , endocrinology , genetics , machine learning , sociology , computer science , biology
Abstract Background The INTERGROWTH‐21st sex and gestational age (GA) specific newborn size standards (IG‐NS) are intended to complement the World Health Organization Child Growth Standards (WHO‐GS), which are not GA‐specific. We examined the implications of using IG‐NS at birth and WHO‐GS at postnatal ages in longitudinal epidemiologic studies. Objectives The aim of this study was to quantify the extent to which standardised measures of newborn size and growth are affected when using WHO‐GS versus IG‐NS at birth among term‐born infants. Methods Data from two prenatal trials in Bangladesh ( n = 755) and The Gambia ( n = 522) were used to estimate and compare size at birth and growth from birth to 3 months when using WHO‐GS only (‘WHO‐GS’) versus IG‐NS at birth and WHO‐GS postnatally (‘IG‐NS’). Mean length‐for‐age (LAZ), weight‐for‐age (WAZ) and head circumference‐for‐age (HCAZ), and the prevalence of undernutrition (stunting: LAZ < −2SD; underweight: WAZ < −2SD; and microcephaly: HCAZ < −2SD) were estimated overall and by GA strata [early‐term (37 0/7 –38 6/7 ), full‐term (39 0/7 –40 6/7 ) and late‐term (41 0/7 –43 0/7 )]. We used Bland–Altman plots to compare continuous indices and Kappa statistic to compare categorical indicators. Results At birth, mean LAZ, WAZ and HCAZ, and the prevalence of undernutrition were most similar among newborns between 39 and 40 weeks of GA when using WHO‐GS versus IG‐NS. However, anthropometric indices were systematically lower among early‐term infants and higher among late‐term infants when using WHO‐GS versus IG‐NS. Early‐term and late‐term infants demonstrated relatively faster and slower growth, respectively, when using WHO‐GS versus IG‐NS, with the direction and magnitude of differences varying between anthropometric indices. Individual‐level differences in attained size and growth, when using WHO‐GS versus IG‐NS, were greater than 0.2 SD in magnitude for >60% of infants across all anthropometric indices. Conclusions Using IG‐NS at birth with WHO‐GS postnatally is acceptable for full‐term infants but may give a misleading interpretation of growth trajectories among early‐ and late‐term infants.