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Published in: BMC Public Health 1/2015

Open Access 01-12-2015 | Research article

Factors associated with uptake of influenza vaccine in people aged 50 to 64 years in Hong Kong: a case–control study

Authors: May PS Yeung, Stephen Kam-Cheung Ng, Edmond Tak Fai Tong, Stephen Sek-Kam Chan, Richard Coker

Published in: BMC Public Health | Issue 1/2015

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Abstract

Background

In Hong Kong, people aged 50–64 years were added as a recommended priority group (recommended group) for influenza vaccination by the Department of Health (DH) starting from 2011/12 onwards. The coverage rate of influenza vaccination for this age group was suboptimal at 8.5 % in 2012/13. This study investigates the factors associated with the uptake of influenza vaccination among adults in Hong Kong aged 50–64 years.

Methods

A case–control study was conducted in communities by street intercept interviews from 17 July to 15 August 2013. Cases were adults aged 50–64 years who had received the influenza vaccine in 2011/12 or 2012/13, while controls were the same as the cases, except they had not received the influenza vaccine in 2011/12 or 2012/13. Multiple logistic regression analysis was performed on the data to explore the associations between vaccination status and the variables.

Results

Six hundred and four respondents in total were interviewed and included in the analysis. There were 193 cases (vaccinated) and 411 controls (non-vaccinated), with a case-to-control ratio of 1:2.1. The following were strongly associated with vaccination compared to other factors: ‘eligible for free government vaccine’ (OR6.38, 95 % CI, 3.43-11.87, p < 0.001); ‘willing to receive flu vaccination for free’ (OR4.84, 95 % CI, 2.13-11.03, p < 0.001); ‘perceived having severe or moderate symptoms when contracting flu’ (OR2.90, 95 % CI, 1.21-6.97, p = 0.02), and ‘convenient to reach a vaccination location’ (OR2.87, 95 % CI, 1.06-7.74, p = 0.04). The majority of the cases (80.8 %) and controls (93.9 %) were not aware that they belonged to a recommended group for influenza vaccination and most (>80 %) were willing to be vaccinated if it was free.

Conclusions

Factors related to free and convenient vaccination, the perception of the severity of symptoms when contracting influenza had a comparatively strong association with influenza vaccination uptake amongst 50–64 year olds, compared to other factors.
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Metadata
Title
Factors associated with uptake of influenza vaccine in people aged 50 to 64 years in Hong Kong: a case–control study
Authors
May PS Yeung
Stephen Kam-Cheung Ng
Edmond Tak Fai Tong
Stephen Sek-Kam Chan
Richard Coker
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Public Health / Issue 1/2015
Electronic ISSN: 1471-2458
DOI
https://doi.org/10.1186/s12889-015-1990-0

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