1. Pandemic A/H1N1 influenza vaccination coverage in Montreal
May Session?

2. Background
27 studies were identified from 11 countries and 4 population sub-groups
Data collected using a survey (n=20) or vaccination registry (n=7)
Coverage varied by population sub- group, country and assessment method used

3. Determinants of pandemic A/H1N1 influenza vaccination
Socioeconomic and demographics:
Male gender
Older age
Higher education
Being a doctor
Regional and household characteristics:
Households with children
Health status and behaviours:
Receiving a prior seasonal influenza vaccination
Being in a priority group for which vaccination was recommended
Beliefs and perceptions:
Believing the vaccine to be safe
Believing the vaccine to be effective
Information, knowledge and advice:
Obtaining information from official medical sources

4. Limitations of literature
Survey methodology:
Many biases:
Selection bias
Poor recall
Reliance on self-report
Vaccination registry:
Inconsistent methods used to estimate the denominator
Regional heterogeneity was observed but not explained

5. Objectives
To describe pandemic A/H1N1 influenza vaccination coverage in Montreal overall and by sex, age group, priority group, and neighbourhood
To identify the neighbourhood socioeconomic and demographic characteristics that are associated with pandemic A/H1N1 influenza vaccination coverage in Montreal among priority groups

6. Methods Numerator Data: Vaccination data from INSPQ
Individual-level vaccination and self-reported demographic data collected during the vaccination campaign
Denominator Data: Publicly available census and survey data
2006 Census populations counts
1998/1999 NPHS QC and 2007/2008 CCHS MTL: Prevalence of chronic conditions by age group applied to census data
2009 ISQ MTL: Birth rate by age group of mother applied to census data and adjusted for multiple births and average pregnancy length
Data analysis:
Calculated vaccination coverage overall and by sex, age group, priority, and neighbourhood
Quasi-Poisson regression model to identify the neighbourhood socioeconomic and demographic determinants of pandemic influenza vaccination

7. Vaccinations in Montreal

10. Cumulative vaccination coverage over time for populations sub-groups
Priority groups
Age groups