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Associations of Early to Mid-Childhood Adiposity with Elevated Mid-Childhood Alanine Aminotransferase Levels in the Project Viva Cohort.

OBJECTIVES: To examine the longitudinal relationship of early to mid-childhood adiposity measures with mid-childhood alanine aminotransferase (ALT) levels.

STUDY DESIGN: We studied 635 children in the Project Viva cohort. Research staff measured weight, height, skinfolds thicknesses, and waist and hip circumferences at early (median 3.2 years) and mid-childhood (median 7.7 years) visits. At mid-childhood, we collected blood for ALT analysis. We used established sex-specific ALT cut-offs to define elevated ALT. In multivariable linear and logistic regression models, we assessed the association of adiposity measures from early to mid-childhood with mid-childhood ALT level, adjusting for confounders.

RESULTS: Children were 48% female, 59% white, 21% black, 6% Hispanic/Latino, and 3% Asian. At early childhood, 29% had overweight/obesity and mean waist circumference was 51.5 (SD 3.8) cm. At mid-childhood, mean ALT was 20.3 (SD 7.3) units/L, and 23% had an elevated ALT. In multivariable-adjusted regression models, each additional 10-cm greater waist circumference at early childhood was associated with 1.99 (95% CI 1.19-3.33) greater odds of elevated ALT at mid-childhood. Greater increases from early to mid-childhood in body mass index z score, sum of subscapular and triceps skinfold thicknesses, waist circumference, and hip circumference were associated with greater ALT at mid-childhood.

CONCLUSIONS: In this prospective cohort, greater waist circumference at early childhood and greater increases in adiposity measures from early to mid-childhood were associated with greater ALT levels at mid-childhood.

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