Events and Meetings of Italian Statistical Society, Advances in Latent Variables - Methods, Models and Applications

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Mortality by education level at late-adult ages in Turin: a survival analysis using frailty models with period and cohort approaches.
Virginia Zarulli, Chiara Marinacci, Giuseppe Costa, Graziella Caselli

Last modified: 2013-06-14


Background. This study investigated the role of unobserved frailty on the estimation of mortality differentials from age 50 on by education level.

Data. We used data of a 36 years follow up from the Turin Longitudinal Study containing 391 170 men and 456 216 women.

Methods. As Turin underwent strong immigration flows during the post war industrialization, also the macro-region of birth was controlled for. We fitted survival analysis models with and without the unobserved heterogeneity component, controlling for mortality improvement from both cohort and period perspectives.

Results. We found that in the majority of the cases, the models without frailty estimated a smaller educational gradient then the models with frailty.

Conclusions. The results draw the attention on the potential underestimation of the mortality inequalities by socioeconomic levels in survival models when not controlling for frailty.

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