Realign ment and multiple imputation of longitudinal data: An application to menstrual cycle data

Sunni L. Mumford, Enrique F. Schisterman, Audrey J. Gaskins, Anna Z. Pollack, Neil J. Perkins, Brian W. Whitcomb, Aijun Ye, Jean Wactawski-Wende

Research output: Contribution to journalArticlepeer-review

Abstract

Summary Mumford SL, Schisterman EF, Gaskins AJ, Pollack AZ, Perkins NJ, Whitcomb BW, Ye A, Wactawski-Wende J. Realignment and multiple imputation of longitudinal data: an application to menstrual cycle data. Paediatric and Perinatal Epidemiology 2011; 25: 448-459. Reproductive hormone levels are highly variable among premenopausal women during the menstrual cycle. Accurate timing of hormone measurement is essential, especially when investigating day-or phase-specific effects. The BioCycle Study used daily urine home fertility monitors to help detect the luteinising hormone (LH) surge in order to schedule visits with biologically relevant windows of hormonal variability. However, as the LH surge is brief and cycles vary in length, relevant hormonal changes may not align with scheduled visits even when fertility monitors are used. Using monitor data, measurements were reclassified according to biological phase of the menstrual cycle to more accurate cycle phase categories. Longitudinal multiple imputation methods were applied after reclassification if no visit occurred during a given menstrual cycle phase. Reclassified cycles had more clearly defined hormonal profiles, with higher mean peak hormones (up to 141%) and reduced variability (up to 71%). We demonstrate the importance of realigning visits to biologically relevant windows when assessing phase-or day-specific effects and the feasibility of applying longitudinal multiple imputation methods. Our method has applications in settings where missing data may occur over time, where daily blood sampling for hormonal measurements is not feasible, and in other areas where timing is essential.

Original languageEnglish (US)
Pages (from-to)448-459
Number of pages12
JournalPaediatric and Perinatal Epidemiology
Volume25
Issue number5
DOIs
StatePublished - Sep 2011
Externally publishedYes

Keywords

  • diet
  • fibre
  • luteinising hormone
  • menstrual cycle
  • missing data
  • multiple imputation
  • oestradiol 2
  • statistical methodology

ASJC Scopus subject areas

  • Epidemiology
  • Pediatrics, Perinatology, and Child Health

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