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- W2023485038 abstract "Many brain structures show a complex, non-linear pattern of maturation and age-related change. Often, quadratic models (β0 + β1age + β2age2 + ε) are used to describe such relationships. Here, we demonstrate that the fitting of quadratic models is substantially affected by seemingly irrelevant factors, such as the age-range sampled. Hippocampal volume was measured in 434 healthy participants between 8 and 85 years of age, and quadratic models were fit to subsets of the sample with different age-ranges. It was found that as the bottom of the age-range increased, the age at which volumes appeared to peak was moved upwards and the estimated decline in the last part of the age-span became larger. Thus, whether children were included or not affected the estimated decline between 60 and 85 years. We conclude that caution should be exerted in inferring age-trajectories from global fit models, e.g. the quadratic model. A nonparametric local smoothing technique (the smoothing spline) was found to be more robust to the effects of different starting ages. The results were replicated in an independent sample of 309 participants." @default.
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- W2023485038 date "2010-05-01" @default.
- W2023485038 modified "2023-10-12" @default.
- W2023485038 title "When does brain aging accelerate? Dangers of quadratic fits in cross-sectional studies" @default.
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- W2023485038 doi "https://doi.org/10.1016/j.neuroimage.2010.01.061" @default.
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