1 Psychology, Université du Québec à Montréal, Montreal, Québec, Canada lavoie.kim@uqam.ca.
2 Montreal Behavioural Medicine Centre, CIUSSS-NIM Research Centre, Montreal, Québec, Canada.
3 Psychology, Université du Québec à Montréal, Montreal, Québec, Canada.
4 Health, Kinesiology and Applied Physiology, Concordia University, Montreal, Québec, Canada.
5 Keenan Research Center, St Michael's Hospital Li Ka Shing Knowledge Institute, Toronto, Ontario, Canada.
6 Medicine, St Michael's Hospital, Toronto, Ontario, Canada.
7 Family Medicine, University of Michigan, Ann Arbor, Michigan, USA.
8 Montreal Behavioural Medicine Centre, Montreal, Québec, Canada.
9 Family Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
10 Psychiatry, University of Ottawa, Ottawa, Ontario, Canada.
11 In

Objective: To examine rates of vaccine hesitancy and their correlates among Canadian adults between April 2020 and March 2021.

Design: Five sequential cross-sectional age, sex and province-weighted population-based samples who completed online surveys.

Setting: Canada.

Participants: A total of 15 019 Canadians aged 18 years and over were recruited through a recognised polling firm (Leger Opinion). Respondents were 51.5% female with a mean age of 48.1 (SD 17.2) years (range 18-95 years) and predominantly white (80.8%).

Primary and secondary outcome measures: Rates of vaccine hesitancy over the five surveys (time points) and their sociodemographic, clinical and psychological correlates.

Results: A total of 42.2% of respondents reported some degree of vaccine hesitancy, which was lowest during surveys 1 (April 2020) and 5 (March 2021) and highest during survey 3 (November 2020). Fully adjusted multivariate logistic regression analyses revealed that women, those aged 50 and younger, non-white, those with high school education or less, and those with annual household incomes below the poverty line in Canada were significantly more likely to report vaccine hesitancy, as were essential and healthcare workers, parents of children under the age of 18 and those who do not get regular influenza vaccines. Endorsing prevention behaviours as important for reducing virus transmission and high COVID-19 health concerns were associated with 77% and 54% reduction in vaccine hesitancy, respectively. Having high personal financial concerns was associated with 1.33 times increased odds of vaccine hesitancy.

Conclusions: Results highlight the importance of targeting vaccine efforts to specific groups by emphasising the outsized health benefits compared with risks of vaccination. Future research should monitor changes in vaccine intentions and behaviour to better understand underlying factors.