Tbf 300a

Sociodemographic (e.g., age, sex, civil status, education, socioeconomic status) and anthropometric (e.g., pregestational weight, current weight, height) data were collected at the moment participants were recruited, when they could be at either the 2nd or 3rd trimester of pregnancy. Data were collected through a questionnaire designed for this study and applied by a trained nutritionist. Socioeconomic status was evaluated and classified using the AMAI (Mexican Association of Market Intelligence and Opinion Agencies) [22 (link)] scores. Weight was measured using a Tanita scale, model TBF-300A with a 0.1 kg precision, and height was measured with a Seca portable stadiometer, model 213. Age was calculated from the participants’ birthdates. Current and pregestational body mass indexes (BMI) were calculated by dividing weight in kilograms by height in meters squared. Current BMI was classified using the Atalah curves for the Latin-American population [23 ]. Hemoglobin status data were obtained from the medical records at the 3^rd trimester of pregnancy.

The anthropometric measurements were taken by trained personnel using standardized protocols (17 ). Body weight and height were determined with an electronic scale (TANITA TBF 300A, USA) and height rod (SECA A800, USA) with an accuracy of 100 g and 1 mm, respectively. Waist circumference (WC) and hip perimeter were measured with a non-distensible tape measure (SECA Model 201, US) using the anthropometric technique (17 ). Nutritional status was classified based on the World Health Organization's body mass index (BMI) cut-off points for adults: underweight: <18.5 kg/m²; normal weight: 18.5-24.9 kg/m²; overweight: 25.0-29.9 kg/m² and obese: ≥30.0 kg/m². The values used to define central obesity in men and women were WC ≥ 102 and 88 cm, respectively. Body composition was determined by measuring four skinfolds (bicipital, sub-scapular, supra-iliac and triceps) and the algorithm of Durnin and Womersley was applied to estimate the percentage of fat mass (18 (link)).