Application of socio-economic-health deprivation index, analysis of mortality and influenza vaccination coverage in the elderly population of Tuscany.

Objective The aim of this paper is to describe the results obtained from the application of a specific local deprivation index, calculated on the basis of 2011 Census sections, to general and cause-specific mortality and influenza vaccination coverage among elderly people of the municipality of Florence. Methods General and cause-specific mortality data (2009-2013) and influenza vaccination coverage data (2015/16 and 2016/17) have been collected for subjects aged ≥65 years residing in the municipality of Florence (Tuscany), at the 2011 Census section level. Socio-Economic and Health Deprivation Index (SEHDI) has been constructed and validated by using socio-economic indicators and mortality ratios. Results Half the Florence population belongs to the medium deprivation group; about 25% belongs to the two most deprived groups, and the remaining 25% is wealthy. Elderly people mostly belong to the high deprivation group. All-cause mortality and cause-specific mortality (cancer and respiratory diseases) reach the highest values in the high deprivation group.Influenza vaccination coverage (VC) is 54.7% for the seasons 2015/16 and 2016/17, combined. VC shows a growing linear trend as deprivation increases. VC appears to be correlated with different factors in the different deprivation groups. Conclusions Socio-economic deprivation plays an important role in health choices, so the application of SEHDI allows to identify the characteristics of the main sub-groups of the population with a low adherence to influenza vaccination. Results of the present study should be spread to General Practitioners in order to help them to promote influenza vaccination to their patients.