A discussion of statistical methods to characterise early growth and its impact on bone mineral content later in childhood

Sarah R. Crozier*, William Johnson, Tim J. Cole, Corrie Macdonald-Wallis, Graciela Muniz-Terrera, Hazel M. Inskip, Kate Tilling

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)
63 Downloads (Pure)

Abstract

Background: Many statistical methods are available to model longitudinal growth data and relate derived summary measures to later outcomes. Aim: To apply and compare commonly used methods to a realistic scenario including pre- and postnatal data, missing data, and confounders. Subjects and methods: Data were collected from 753 offspring in the Southampton Women’s Survey with measurements of bone mineral content (BMC) at age 6 years. Ultrasound measures included crown-rump length (11 weeks’ gestation) and femur length (19 and 34 weeks’ gestation); postnatally, infant length (birth, 6 and 12 months) and height (2 and 3 years) were measured. A residual growth model, two-stage multilevel linear spline model, joint multilevel linear spline model, SITAR and a growth mixture model were used to relate growth to 6-year BMC. Results: Results from the residual growth, two-stage and joint multilevel linear spline models were most comparable: an increase in length at all ages was positively associated with BMC, the strongest association being with later growth. Both SITAR and the growth mixture model demonstrated that length was positively associated with BMC. Conclusions: Similarities and differences in results from a variety of analytic strategies need to be understood in the context of each statistical methodology.

Original languageEnglish
Pages (from-to)17-26
Number of pages10
JournalAnnals of Human Biology
Volume46
Issue number1
Early online date5 Feb 2019
DOIs
Publication statusPublished - 15 Apr 2019

Keywords

  • Growth mixture models
  • lifecourse epidemiology
  • linear spline models
  • multilevel models
  • SITAR

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