Risk perception and knowledge about osteoporosis: well informed but not aware? A cross-sectional study.

Identify the level of knowledge and risk perception of developing osteoporosis (OP) and its association with socio-demographic variables and risk factors. Individuals older than 18 years living in Mexico City were surveyed. The sample, which was designed to be representative of this population, was randomly selected and stratified by socioeconomic level, age, and sex. The Multiple Osteoporosis Prevention Survey, designed to assess OP-related knowledge, risk perception, was used. Four hundred and fifty-five individuals, homogeneously distributed according to defined strata, were surveyed. Almost 29 % (28.9 %) of subjects consumed tobacco, and 13.4 % had a family history of OP. Most subjects reported a lower-than-recommended calcium daily intake. Fifty-three and a half percent identified most risk factors adequately, and almost all (97.9 %) had received some sort of information about OP. Sixty-six and a half percent of subjects perceived OP as a serious disease; 51.5 % considered themselves to be personally responsible for acquiring it; 50.2 % were concerned about suffering from it; and 47.1 % considered it likely they would develop it. The most important variables associated with the perception of risk were age (<45 years), gender (female), and family history of OP. Subjects considered it more likely, more serious, and felt more worried and personally responsible about developing a heart condition or cancer than OP; they felt less concerned, less personally responsible, and less likely to contract AIDS or develop Alzheimer's. Individuals know a lot about OP, but they engage in risky behaviors and lack perception of their risk in developing it. Interventions should aim at raising awareness about personal responsibility and about the likelihood of developing this condition.