{
  "abstract": "COVID-19 vaccination is associated with small, temporary increases in menstrual cycle length and bleeding volume among individuals with regular cycles prior to vaccination. 1–3 However, post-vaccination menstrual disturbances among individuals with irregular cycles, who make up approximately one quarter of the menstruating population,4 have only been examined using cross-sectional retrospective reporting. This study used prospectively collected data to determine whether post-COVID-19 vaccination changes in menstrual bleeding volume and menses length differ by pre-vaccination cycle regularity patterns.",
  "authors": [
    {
      "affiliations": [
        "Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon, USA",
        "OHSU-PSU School of Public Health, Portland, Oregon, USA"
      ],
      "name": "Emily R Boniface"
    },
    {
      "affiliations": [
        "Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon, USA",
        "OHSU-PSU School of Public Health, Portland, Oregon, USA",
        "Centro de Investigación en Salud Poblacional (CISP), Instituto Nacional de Salud Publica (INSP), Cuernavaca, Mexico"
      ],
      "name": "Blair G Darney"
    },
    {
      "affiliations": [
        "Natural Cycles Nordic AB, Stockholm, Sweden"
      ],
      "name": "Agathe van Lamsweerde"
    },
    {
      "affiliations": [
        "Natural Cycles Nordic AB, Stockholm, Sweden"
      ],
      "name": "Eleonora Benhar"
    },
    {
      "affiliations": [
        "Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon, USA"
      ],
      "name": "Leo Han"
    },
    {
      "affiliations": [
        "Department of Obstetrics and Gynecology, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA"
      ],
      "name": "Kristen Matteson"
    },
    {
      "affiliations": [
        "Department of Metabolism Digestion and Reproduction, Imperial College London, London, UK"
      ],
      "name": "Victoria Male"
    },
    {
      "affiliations": [
        "Institute for Repair and Regeneration, Centre for Reproductive Health, University of Edinburgh, Edinburgh, UK"
      ],
      "name": "Sharon Cameron"
    },
    {
      "affiliations": [
        "Montpellier Institute of Evolutionary Sciences (ISEM), Montpellier University, Montpellier, France"
      ],
      "name": "Alexandra Alvergne"
    },
    {
      "affiliations": [
        "Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon, USA"
      ],
      "name": "Alison Edelman"
    }
  ],
  "title": "Association between menstrual cycle pattern regularity and changes in menstrual bleeding following COVID-19 vaccination: secondary analysis of an observational study",
  "uid": "1836c9e7-efd0-5ede-a02d-6b227ca0a800"
}