and a survey questionnaire in which participants assess different dimensions of their own health.
[4] Although the answer to the self-rated health question is based on what people think—and thus is subjective—it is a statistically powerful predictor of mortality in the general population[5][6][7] and has also been shown to predict morbidity.
[8] However, it is also possible that there are systematic differences in how individuals with specific characteristics report their health.
In such a questionnaire, participants answer a series of questions which are typically structured using a Likert Scale.
[4][13] This measure helps follow the evolution of health across time and between populations.