STUDY OBJECTIVE--This study aimed to analyse the influence of social, economic, and health development on infant and perinatal mortality in Spain between 1975 and 1986, and to identify possible changes in these relationships over time. DESIGN--Study of the association between mortality and a range of variables. SETTING--50 Spanish provinces. MEASUREMENTS AND MAIN RESULTS--Mean infant and perinatal mortality were estimated for two periods--1975-8 and 1983-6. Social, economic, and health care indicators were collected as independent variables for these two periods. The rates of variation between periods were estimated for each variable. Multiple linear regression models were used to define the association between infant and perinatal mortality and their respective rate of variation with the former indicators. Mean familial income was the main predictive factor for infant and perinatal mortality in the first period but in the second period health care indicators were more relevant. CONCLUSIONS--The reduction in Spanish infant and perinatal mortality over the period can be attributed mainly to the improvement in prenatal and neonatal health care in Spain in recent years, while economic factors seem less important.
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