Anthropometric Measures at Birth

Birth weight was measured as early as possible within 7 days after birth using standard procedures and highly trained research assistants (20 ) using electronic weighing scales precise to 10 g. Birth length was measured with collapsible length boards, which were precise to 1 mm. Gestational age was calculated as the number of days between the first day of the last menstrual period (obtained prospectively by village health workers during their biweekly home visits) and the day of delivery. Prior work has reported on accuracy and validity of estimates compared to ultrasound measurements in this study (21 (link)). A pre-term birth was defined as a birth occurring before 37 completed weeks of pregnancy. Small for gestational age (SGA) was defined as a birth weight below the 10th percentile for gestational age and sex (22 (link)).

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Young M.F., Nguyen P., Tran L.M., Khuong L.Q., Tandon S., Martorell R, & Ramakrishnan U. (2023). Maternal hemoglobin concentrations across pregnancy and child health and development from birth through 6–7 years. Frontiers in Nutrition, 10, 1114101.

Publication 2023

Birth Birth weight Delivery Gestational age Home visits Menstrual period Pregnancy Term birth Ultrasound Village health workers

Corresponding Organization :

Other organizations : Emory University, International Food Policy Research Institute, Hanoi School Of Public Health

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Variable analysis

independent variables

Gestational age

dependent variables

Birth weight
Birth length
Pre-term birth
Small for gestational age (SGA)

control variables

Measurements performed using standard procedures and highly trained research assistants
Electronic weighing scales precise to 10 g for birth weight
Collapsible length boards precise to 1 mm for birth length
Gestational age calculated from the first day of the last menstrual period

positive controls

Prior work has reported on accuracy and validity of gestational age estimates compared to ultrasound measurements in this study

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