COVID-19 Risk and Immunity in Montreal North: A Population based Study [RISC-MTL, study data contributed to the CITF Databank]

Methods

The RISC study is a two-phase, population-based case-control study that recruited participants aged 18 and older from Montréal-Nord and other Montreal neighborhoods. Data collection included online questionnaires to gather sociodemographic information, risk factors, and vaccination history, along with a self-administered dried blood test to detect COVID-19 antibodies, indicating previous infections or vaccine-acquired immunity.

A subsample of participants also participated in qualitative interviews to provide deeper insights. Contributed dataset contents: The datasets include 2,449 primary respondents who completed baseline surveys between August 2021 and November 2022. Questionnaire data for an additional 3,066 household members are included. 1,466 primary respondents (60%) gave one blood sample between September 2021 and August 2022 for analysis.

Variables include data in the following areas of information: demographics (age, gender, race-ethnicity and indigeneity, education, occupation, household composition), general health (smokes, chronic conditions, weight, health behaviours, flu vaccine), exposure risk factors (travel history, adherence to COVID-19 public health guidelines), COVID infection history (dates of positive rapid antigen or PCR tests, hospitalizations, symptoms), SARS-CoV-2 vaccination, and serology (IgG against SARS-CoV-2 RBD, nucleocapsid, and spike proteins).