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A case study of glucose levels during sleep using multilevel fast function on scalar regression inference

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Listed:
  • Renat Sergazinov
  • Andrew Leroux
  • Erjia Cui
  • Ciprian Crainiceanu
  • R. Nisha Aurora
  • Naresh M. Punjabi
  • Irina Gaynanova

Abstract

Continuous glucose monitors (CGMs) are increasingly used to measure blood glucose levels and provide information about the treatment and management of diabetes. Our motivating study contains CGM data during sleep for 174 study participants with type II diabetes mellitus measured at a 5‐min frequency for an average of 10 nights. We aim to quantify the effects of diabetes medications and sleep apnea severity on glucose levels. Statistically, this is an inference question about the association between scalar covariates and functional responses observed at multiple visits (sleep periods). However, many characteristics of the data make analyses difficult, including (1) nonstationary within‐period patterns; (2) substantial between‐period heterogeneity, non‐Gaussianity, and outliers; and (3) large dimensionality due to the number of study participants, sleep periods, and time points. For our analyses, we evaluate and compare two methods: fast univariate inference (FUI) and functional additive mixed models (FAMMs). We extend FUI and introduce a new approach for testing the hypotheses of no effect and time invariance of the covariates. We also highlight areas for further methodological development for FAMM. Our study reveals that (1) biguanide medication and sleep apnea severity significantly affect glucose trajectories during sleep and (2) the estimated effects are time invariant.

Suggested Citation

  • Renat Sergazinov & Andrew Leroux & Erjia Cui & Ciprian Crainiceanu & R. Nisha Aurora & Naresh M. Punjabi & Irina Gaynanova, 2023. "A case study of glucose levels during sleep using multilevel fast function on scalar regression inference," Biometrics, The International Biometric Society, vol. 79(4), pages 3873-3882, December.
    • Handle: RePEc:bla:biomet:v:79:y:2023:i:4:p:3873-3882
    DOI: 10.1111/biom.13878
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    References listed on IDEAS

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