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Table 2 Intra-cluster correlation (ICC) of serum total IgE (sIgEtot) evaluated over the 12-month study period in three strata of asthmatic patients based on sIgEtot at baseline: < 76 IU/mL (n = 10); 76–700 IU/mL (n = 20) and > 700 IU/mL (n = 11)

From: Variability in total serum IgE over 1 year in severe asthmatics

  ICC (95% CI) (*) 1-ICC (95% CI) p-value (**)
< 76 IU/mL 96 (93–98) % 4 (2–7) %  
76–700 IU/mL 71 (62–82) % 29 (18–38) % < 0.0001
> 700 IU/mL 96 (94–99) % 4 (1–6) %  
  1. CI, confidence interval
  2. * Between-patient variability/(between- + within-patient variability)** likelihood ratio test comparing within-patient variabilities