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Table 1 Intraclass correlation coefficients for test-retest reliability of T/S ratios at 4, 12, and 18 months

From: Impact of prenatal tobacco smoking on infant telomere length trajectory and ADHD symptoms at 18 months: a longitudinal cohort study

  Intraclass correlation coefficient (ICC)
Time point Modela ICC value 95% confidence interval p-value
4 months ICC (A,1) 0.948 0.925–0.966 < 0.001
ICC (A,k) 0.991 0.987–0.994 < 0.001
12 months ICC (A,1) 0.944 0.916–0.965 < 0.001
ICC (A,k) 0.99 0.985–0.994 < 0.001
18 months ICC (A,1) 0.924 0.884–0.953 < 0.001
ICC (A,k) 0.987 0.979–0.992 < 0.001
  1. aModel structure, type, and definition based on the McGraw and Wong classification. All computations considered two-way random effect models, absolute agreement, for ICC (A,1), single measurement; and ICC (A,k), average measurements