C4A and hyperinsulinemic hypoglycemia, familial, 4: Low GCNs of C4T (C4T=2+3) and C4A deficiency (C4A=0+1) were strongly correlated with increased risk of IIM with OR equalled to 2.58 (2.28–2.91), p=5.0×10−53 for C4T, and 2.82 (2.48–3.21), p=7.0×10−57 for C4A deficiency.