. 2021 Aug 24;36(5):442–460. doi: 10.1177/07487304211032336

Table 4.

Summary of linear regression analysis.

Photoperiod	Genotype	Slope	R ²	p-Value
A
8 h	Wildtype	−0.37	0.98	<.01
8 h	Pdf⁰	−0.76	0.99	<.01
12 h	Wildtype	−0.35	0.88	<.05
	Pdf⁰	−0.96	0.98	<.01
	per^S	−0.78	0.97	<.01
16 h	Wildtype	−0.44	0.92	<.01
16 h	Pdf⁰	−0.97	0.98	<.001
B
8 h	Wildtype	0.62	0.99	<.01
8 h	Pdf⁰	0.23	0.94	<.05
12 h	Wildtype	0.64	0.96	<.01
	Pdf⁰	0.03	0.07	Ns
	per^S	0.21	0.72	.06
16 h	Wildtype	0.55	0.95	<.01
16 h	Pdf⁰	0.03	0.07	Ns

The slope, R² value and p-value of the linear relationship between T-cycle period and phase of E activity peak in wildtype, Pdf ⁰ and per^S flies under different photoperiod conditions. Summaries of regression analysis performed (A) using E activity peak phases expressed as time since lights-on (h), and (B) using E activity peak phases expressed as time elapsed since previous lights-off (h).