SERPINC1 and hyperinsulinemic hypoglycemia, familial, 4: Patients with an antithrombin III deficiency had fewer mean (SD) ventilator-free days (27.8 [5.1] vs 29.6 [1.4]; P = .0003), hospital-free days (20.3 [8.2] vs 24.0 [5.7]; P = 1.37 × 10−6), and ICU-free days (25.7 [4.9] vs 27.7 [2.3]; P = 9.38 × 10−6) compared with patients without a deficiency.