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

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

	Intraclass correlation coefficient (ICC)
Time point	Model^a	ICC value	95% confidence interval	p-value
4 months	ICC (A,1)	0.948	0.925–0.966	< 0.001
4 months	ICC (A,k)	0.991	0.987–0.994	< 0.001
12 months	ICC (A,1)	0.944	0.916–0.965	< 0.001
12 months	ICC (A,k)	0.99	0.985–0.994	< 0.001
18 months	ICC (A,1)	0.924	0.884–0.953	< 0.001
18 months	ICC (A,k)	0.987	0.979–0.992	< 0.001

^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

ISSN: 1741-7015