. Author manuscript; available in PMC: 2016 Dec 1.

Published in final edited form as: Psychoneuroendocrinology. 2015 Aug 21;62:217–226. doi: 10.1016/j.psyneuen.2015.08.016

Table 4.

Intraclass Correlations Assessing Stability of Cortisol Across Three Days

	TD (n=36)		ASD (n=27)		ICC Difference (ASD-TD)
Measure	ICC₁ (95% CI)	ICC₃ (95% CI)	ICC₁ (95% CI)	ICC₃ (95% CI)	ICC₁ (95% CI)	ICC₃ (95% CI)
Morning 1	.45 (−22, .66)	.71 (.49, .87)	.31 (.10, .52)	.57 (.29, .79)	−.14 (−.44, 17)	−.13 (−.49, .17)
Morning 2	.63 (.43, .79)	.84 (.72, .93)	.41 (.20, .61)	.67 (.47, .85)	−.22 (−.49, .06)	−.16 (−.39, .07)
Afternoon	.32 (.07, .56)	.58 (.24, .83)	.41 (.20, .61)	.67 (.46, .84)	.09 (−.22, .41)	.09 (−.24, .51)
Evening	.44 (.21, .66)	.70 (.47, .87)	.56 (.35, .73)	.79 (64, .91)	.11 (−.19, .42)	.09 (−.16, .36)
Daily Mean	.62 (.40, .79)	.83 (.68, .93)	.56 (.36, .75)	.80 (.64, .91)	−.05 (−.34, .22)	−.03 (−.24, .16)
CAR (M1-M2)	.38 (.14, .61)	.64 (.38, .84)	.48 (.28, .68)	.73 (.55, .87)	.10 (−.22, .40)	.09 (−.20, .41)
Linear Decline (M2-E)	.33 (.10, .60)	.59 (.26, .83)	.57 (.35, .75)	.80 (.64, .91)	.24 (−.10, .54)	.20 (−.11, 55)

Cortisol values are log-transformed. ICC₁=Estimated intraclass correlation of cortisol assessed on a single day. ICC₃ = Estimated intraclass correlation of cortisol aggregated across three days. ICC estimates are the medians of the Bayesian posterior distribution. CI= 95% Bayesian Highest Posterior Density (HPD) interval of the posterior distribution.