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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: J Biol Rhythms. 2013 Apr;28(2):117–129. doi: 10.1177/0748730413478552

Table 2.

Parameters of the Best-Fit Cosine Curves for the Daily Rhythms of Cerebral Cortex PER2, PER3, and ARNTL1 Expression

Gene Parameter
μ (Mesor) A (Amplitude) φ (Acrophase)
PER2 0.00 [−0.02-0.02] p=0.84 0.06 [0.04–0.08] p=0.0039 10:38 [9:20–11:56] p<0.001
PER3 0.00 [−0.02-0.02] p=0.61 0.03 [0.02–0.04] p=0.0027 10:44 [9:29–11:59] p<0.001
ARNTL1 0.01 [−0.00–0.02] p=0.31 0.05 [0.04–0.06] p=0.00048 21:23 [20:16–22:30] p=0.019

Effect estimates [95% confidence intervals] p-values. Model parameters estimated using nonlinear least squares regression.