Patient reports of health status as predictors of physiologic health measures in chronic disease.

Accurate assessment of health status and forecasting of risk for poor outcomes in chronic disease require a broad representation of health measures. To support this conclusion, the health of patients with diabetes (N = 73) and hypertension (N = 105) was assessed using measures of physical and role functioning, perceived health, and disease severity (blood sugar or diastolic blood pressure, respectively, for diabetes and hypertension). Health questionnaires measuring functional limitations, overall health rating, level of health concern, perceived susceptibility to illness, and number of health problems were administered at study enrollment. Laboratory tests for blood sugar (hemoglobin A1) and diastolic blood pressures were performed at enrollment and were repeated at a subsequent clinic visit, from 3 to 6 months later. Functional limitations correlated significantly with elevated blood sugar (r = 0.57) and blood pressure (r = 0.49) at study enrollment. Perceived poor health was not substantially related to either physiologic measure at enrollment. Using ordinary least squares regression, the best predictor of both blood sugar and blood pressure at follow-up was baseline blood sugar and blood pressure, respectively. However, both functional limitations and perceived poor health made significant and independent contributions to the prediction of blood sugar and blood pressure at follow-up. The results underscore the value of both health survey measures and clinical measures in studies of chronic disease.