As a way of forecasting future evolution of inequalities in disease burden
and mortality, trends in preventive health behaviours by social class were
examined, Using the Spanish National Health Survey from 1987 to 1997 the ev
olution of the Health Practices Index (smoking, alcohol consumption, physic
al exercise, sleep hours and the Quetelet index) is described for the Spani
sh non-institutionalised adult population. In the last 10 years the disadva
ntaged population of Spain (social class groups IV and V) has not opted for
healthier behavioural choices. On the contrary the Health Practices Index
figures have worsened during the study period. Conversely, the more affluen
t groups (social class groups I, II and III) have exhibited a net gain in t
he index. Due to this, an increase in the existing gap in health inequaliti
es in Spain in terms of morbidity and mortality can be forecast for the nea
r future. As time trends of a summary indicator of preventive health behavi
ours by social class have not been described in other countries, a replicat
ion of this study in different cultural, social and economic milieus could
produce valuable information.