The study examines the predictive power of self-rated health status on mortality using data from the National Health and Nutrition Examination Survey (NHANES-I) Epidemiologic Follow-Up Study (NHEFS). The sample includes 6,440 adults aged 25–74 years with comprehensive physical examination data and follow-up survival information. Self-rated health is assessed through a single question asking respondents to rate their health as excellent, very good, good, fair, or poor. Proportional hazards analyses show that self-rated health at Time 1 is significantly associated with mortality over the 12-year follow-up period among middle-aged males, but not among elderly males or females of any age. The study highlights that self-rated health is a powerful predictor of mortality, comparable to detailed health indicators. However, the findings suggest that the association between self-rated health and mortality is influenced by sociodemographic factors, health behaviors, and medical diagnoses. For middle-aged men, self-rated health remains a significant predictor of mortality even after controlling for these factors. In contrast, for women, the association disappears when sociodemographic and health behavior variables are controlled. The study also notes that self-rated health may reflect actual health status, but it is not always a reliable indicator. The results indicate that self-rated health is more strongly associated with mortality in middle-aged men than in women. The study concludes that self-rated health is an important predictor of mortality, particularly in middle-aged men, and that it should continue to be of interest as a mortality predictor in both homogeneous community samples and large national samples. Self-ratings of health are inexpensive, easy to obtain, and already available in nearly all health surveys, making them valuable tools for health researchers.The study examines the predictive power of self-rated health status on mortality using data from the National Health and Nutrition Examination Survey (NHANES-I) Epidemiologic Follow-Up Study (NHEFS). The sample includes 6,440 adults aged 25–74 years with comprehensive physical examination data and follow-up survival information. Self-rated health is assessed through a single question asking respondents to rate their health as excellent, very good, good, fair, or poor. Proportional hazards analyses show that self-rated health at Time 1 is significantly associated with mortality over the 12-year follow-up period among middle-aged males, but not among elderly males or females of any age. The study highlights that self-rated health is a powerful predictor of mortality, comparable to detailed health indicators. However, the findings suggest that the association between self-rated health and mortality is influenced by sociodemographic factors, health behaviors, and medical diagnoses. For middle-aged men, self-rated health remains a significant predictor of mortality even after controlling for these factors. In contrast, for women, the association disappears when sociodemographic and health behavior variables are controlled. The study also notes that self-rated health may reflect actual health status, but it is not always a reliable indicator. The results indicate that self-rated health is more strongly associated with mortality in middle-aged men than in women. The study concludes that self-rated health is an important predictor of mortality, particularly in middle-aged men, and that it should continue to be of interest as a mortality predictor in both homogeneous community samples and large national samples. Self-ratings of health are inexpensive, easy to obtain, and already available in nearly all health surveys, making them valuable tools for health researchers.