highly significantp < .001
A three factor ANOVA testing for the effects of zeitgeber period, day length and genotype on the phase of E activity (done for T22 to T28) revealed highly significant effects of all factors on the timing of E activity, zeitgeber period: F (3,663) = 496.96; p < .001; day length: F (2,663) = 2943.38; p < .001; genotype: F (1,663) = 2716.92; p < .001.