BMI of the 57 patients who survived their initial episode of TTP. Data are from the time of their initial diagnosis of TTP. Black bars represent patients; gray bars represent the expected prevalence based on age, race, and gender-specific rates from the NHANES US reference population. Patients’ BMI during follow-up was not different from initial values (n = 52; median follow-up, 5.7 years; range, 0.2 to 16.5 years; P = .922).