Mean (± SEM) period of activity onsets and precision, and linear and quadratic regression analysis in male wild type and mutant Syrian hamsters.

Groups with different superscripts differ significantly at P2 values reflect first and second order regression fits of τDD vs. precision within the respective group, respectively. Even in cases in which regression fit was statistically significant, the maximum precision did not occur at the mean τDD. When all male hamsters were combined and analyzed across genotypes, linear and quadratic fits were both statistically significant at the P2 value was low (0.09 and 0.118, respectively).