Impact of area deprivation on the cardiac mortality in the UK between1991 and 2010: evidence from a population-based longitudinal study

Abstract

Aims: Evidence from longitudinal studies on the influence of area deprivation in cardiac mortality is limited. We aimed to examine the impact of area deprivation on cardiac mortality in a large representative Scottish population. We also examined differences between women and men. Methods and results: Retrospective analysis was performed by using linked data from Scottish Longitudinal Study from 1991 to 2010. The main exposure variable was socioeconomic status using the Carstairs deprivation scores, a composite score of area-level factors. Cox proportional-hazards models were constructed to evaluate the hazard ratios (HRs) and 95% confidence intervals (CIs) for cardiac mortality and all-cause mortality associated with area-based deprivation. Subgroup analyses were stratified by sex. In a representative population of 217 965 UK adults, a total of 58 770 deaths occurred over a median of 10 years of follow-up period. The risk of cardiac mortality and all-cause mortality showed a consistent graded increased across the deprived groups. Compared to the least deprived group, the adjusted HR of cardiac mortality in the most deprived group was 1.27 (1.15-1.39, P < 0.000). There was strong evidence that women from more deprived areas had significantly higher cardiac death risk than those from the least deprived areas (HR 1.42, 95% CI 1.22-1.65), while this observation was not strong in men with same background. Conclusion: Our study demonstrated area deprivation was the strong predictor of long-term cardiac mortality and all-cause mortality. The inequalities were substantially greater in women from more deprived areas than men from the same background.