SERPINC1 and hyperinsulinemic hypoglycemia, familial, 4: Antithrombin III deficiency showed a nonsignificant association with mortality (12 of 133 [9.0%] vs 2 of 159 [1.3%]; P = .004) (Table 2) but did not reach significance using a Bonferroni-corrected type I error rate of 0.0006.