Secular Trends in Pubertal Growth Acceleration in Swedish Boys Born from 1947 to 1996

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Abstract

Importance: A secular trend for earlier menarcheal age has been established in girls but there are few studies of pubertal timing for boys. Objective: To determine if there is a secular trend for earlier pubertal timing among boys. Design, Setting, and Participants: For this population-based retrospective cohort study conducted in Gothenburg, Sweden, we collected heights and weights from school health records for boys born consecutively from January 1 and onwards in 1947 and every 5 years from 1951 to 1996 (n = 375 for each birth cohort from 1947-1991, n = 340 for the birth cohort in 1996, and n = 4090 for the total cohort). We estimated age at the peak height velocity (PHV), the maximum growth velocity during puberty, and childhood body mass index (BMI) at age 8 years for all study participants. The data were analyzed during 2018 and 2019. Boys were eligible if they had a complete personal identity number and data to calculate their age at PHV and childhood BMI. Approximately 2.4% of the original study population was excluded because they lacked a personal identity number, and in the remaining study population, 4090 (69%) had sufficient data to calculate childhood BMI and age at PHV. Exposures: The exposure was birth year and a potential confounding factor was childhood BMI. Main Outcomes and Measures: The outcome was age at PHV. Results: Of the 4090 participants, most were white and the mean (SD) age at PHV was 13.9 (1.1) years. A linear regression model revealed a significant association between year of birth and age at PHV. Age at PHV was 1.5 months earlier for every decade increase in birth year (95% CI, -1.72 to -1.19; P

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APA

Ohlsson, C., Bygdell, M., Celind, J., Sondén, A., Tidblad, A., Sävendahl, L., & Kindblom, J. M. (2019, September 1). Secular Trends in Pubertal Growth Acceleration in Swedish Boys Born from 1947 to 1996. JAMA Pediatrics. American Medical Association. https://doi.org/10.1001/jamapediatrics.2019.2315

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