The C-statistics value adjusted for multiple risk factors was 0.7701 (CI: 0.7510–0.7892) and increased to 0.7718 (CI: 0.7527–0.7909), when follistatin was added (difference in C-statistics, 0.0017; p = 0.113), which may suggest that follistatin does not improve diabetes prediction on its own beyond established risk factors. The gene discussed is FST; the disease is diabetes mellitus.