C3 and Hepatomegaly: The univariate analysis showed that patient' age (OR, 2.432; 95% CI, 1.586–3.774; p < 0.001), hepatomegaly (OR, 0.407; 0.169–0.979; p = 0.045), RBC counts (OR, 0.594; 95% CI, 0.356–0.992; p < 0.001), hemoglobin (OR, 1.037; 95% CI, 1.014–1.049; p < 0.001), RBC counts (OR, 1.858; 95% CI, 1.215–2.843; p = 0.004), low level of complement C3 (OR, 0.537; 95% CI, 0.332–0.869; p = 0.011), CMV IgM positive (OR, 0.143; 95% CI, 0.044–0.465; p = 0.001), and HSV-2 IgG positive (OR, 0.924; 95% CI, 0.887–0.963; p < 0.001) were associated with chronic ITP (Table 3).