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Temporal trends and determinants of COVID-19 vaccine coverage and series initiation during pregnancy in Ontario, Canada, December 2020 to December 2021: A population-based retrospective cohort study.
Fell, Deshayne B; Török, Eszter; Sprague, Ann E; Regan, Annette K; Dhinsa, Tavleen; Alton, Gillian D; Dimanlig-Cruz, Sheryll; MacDonald, Shannon E; Buchan, Sarah A; Kwong, Jeffrey C; Wilson, Sarah E; Håberg, Siri E; Gravel, Christopher A; Wilson, Kumanan; Dunn, Sandra I; Shah, Prakesh S; El-Chaâr, Darine; Barrett, Jon; Walker, Mark C; Okun, Nannette; Dougan, Shelley D.
  • Fell DB; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada. Electronic address: dfell@cheo.on.ca.
  • Török E; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
  • Sprague AE; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
  • Regan AK; School of Nursing and Health Professions, University of San Francisco, San Francisco, CA, USA; Department of Epidemiology, UCLA Fielding School of Public Health, Los Angeles, CA, USA.
  • Dhinsa T; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
  • Alton GD; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
  • Dimanlig-Cruz S; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
  • MacDonald SE; Faculty of Nursing, University of Alberta, Edmonton, AB, Canada; School of Public Health, University of Alberta, Edmonton, AB, Canada; Department of Pediatrics, University of Calgary, Calgary, AB, Canada.
  • Buchan SA; Public Health Ontario, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.
  • Kwong JC; Public Health Ontario, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada; ICES, Toronto, ON, Canada; Department of Family and Community Medicine, University of Toronto, Toronto, ON, Canada.
  • Wilson SE; Public Health Ontario, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.
  • Håberg SE; Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway.
  • Gravel CA; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada.
  • Wilson K; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Medicine, University of Ottawa, Ottawa, ON, Canada; Bruyère Research Institute, Ottawa, ON, Canada.
  • Dunn SI; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; School of Nursing, University of Ottawa, Ottawa, ON, Canada.
  • Shah PS; Department of Pediatrics, Mount Sinai Hospital, Toronto, ON, Canada; Department of Pediatrics, University of Toronto, Toronto, ON, Canada; Maternal-infant Care Research Centre, Department of Pediatrics, Mount Sinai Hospital, Toronto, ON, Canada; Institute of Health Policy, Management and Evaluation,
  • El-Chaâr D; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, ON, Canada.
  • Barrett J; Department of Obstetrics and Gynecology, McMaster University, Hamilton, ON, Canada.
  • Walker MC; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada; Clinical Epidemiology Program, Ottawa Hospital
  • Okun N; Department of Obstetrics and Gynaecology, University of Toronto, Toronto, ON, Canada.
  • Dougan SD; Children's Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, ON, Canada; Better Outcomes Registry & Network (BORN) Ontario, Ottawa, Ontario, ON, Canada.
Vaccine ; 41(10): 1716-1725, 2023 03 03.
Article in English | MEDLINE | ID: covidwho-2221472
ABSTRACT

BACKGROUND:

Population-based COVID-19 vaccine coverage estimates among pregnant individuals are limited. We assessed temporal patterns in vaccine coverage (≥1 dose before or during pregnancy) and evaluated factors associated with vaccine series initiation (receiving dose 1 during pregnancy) in Ontario, Canada.

METHODS:

We linked the provincial birth registry with COVID-19 vaccination records from December 14, 2020 to December 31, 2021 and assessed coverage rates among all pregnant individuals by month, age, and neighborhood sociodemographic characteristics. Among individuals who gave birth since April 2021-when pregnant people were prioritized for vaccination-we assessed associations between sociodemographic, behavioral, and pregnancy-related factors with vaccine series initiation using multivariable regression to estimate adjusted risk ratios (aRR) and risk differences (aRD) with 95% confidence intervals (CI).

RESULTS:

Among 221,190 pregnant individuals, vaccine coverage increased to 71.2% by December 2021. Gaps in coverage across categories of age and sociodemographic characteristics decreased over time, but did not disappear. Lower vaccine series initiation was associated with lower age (<25 vs. 30-34 years aRR 0.53, 95%CI 0.51-0.56), smoking (vs. non-smoking 0.64, 0.61-0.67), no first trimester prenatal care visit (vs. visit 0.80, 0.77-0.84), and residing in neighborhoods with the lowest income (vs. highest 0.69, 0.67-0.71). Vaccine series initiation was marginally higher among individuals with pre-existing medical conditions (vs. no conditions 1.07, 1.04-1.10).

CONCLUSIONS:

COVID-19 vaccine coverage among pregnant individuals remained lower than in the general population, and there was lower vaccine initiation by multiple characteristics.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Vaccines / COVID-19 Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study Topics: Vaccines Limits: Female / Humans / Pregnancy Country/Region as subject: North America Language: English Journal: Vaccine Year: 2023 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Vaccines / COVID-19 Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study Topics: Vaccines Limits: Female / Humans / Pregnancy Country/Region as subject: North America Language: English Journal: Vaccine Year: 2023 Document Type: Article