Table 1 Wheel-running activity distribution and free-running periods in T24, T30 and DD.

	Condition	Bifurcation Symmetry Index (BSI)	Activity in Light (%)		Condition	Bifurcation Symmetry Index (BSI)	Activity in Light (%)		Free-running Period (h)	N
Expt 1	LDim7:5	0.65 ± 0.04	2.0 ± 0.5	→	LDim10:5	0.79 ± 0.03	2.0 ± 2.4	→	23.65 ± 0.07	10
	LDark7:5	0.31 ± 0.05	16.6 ± 2.1	→	LDark10:5	0.48 ± 0.05	27.5 ± 3.4	→	23.92 ± 0.05	20
		p < 0.001	p < 0.0001^*			p < 0.001^*	p < 0.0001^*		p < 0.01
Expt 2	LDim7:5	0.84 ± 0.02	1.6 ± 0.7	→	LDim10:5	0.78 ± 0.05	2.6 ± 0.6	→	n/d	15
	LDim7:5	0.87 ± 0.02	1.8 ± 0.4	→	LDark10:5	0.79 ± 0.04	9.3 ± 2.7	→	n/d	16
		ns	ns			ns	p < 0.05^*
Expt 3	LDim7:5	0.70 ± 0.04	0.7 ± 0.1	→	LDim7:5	0.60 ± 0.03	1.4 ± 0.3a	→	23.78 ± 0.04d	8
	LDim7:5	0.67 ± 0.03	2.5 ± 2.0	→	LDim10:5	0.85 ± 0.02	2.2 ± 1.1a	→	23.65 ± 0.02	8
		ns	ns			p < 0.001	ns
	LDark14:10	n/d	1.7 ± 0.2b	→	LDark20:10	n/d	20.2 ± 3.7c	→	23.82 ± 0.04d	16
	LDim14:10	n/d	0.8 ± 0.2	→	LDim20:10	n/d	5.3 ± 1.1	→	23.75 ± 0.03d	16
	LDim19:5	n/d	3.5 ± 1.4b	→	LDim25:5	n/d	10.5 ± 2.9	→	23.56 ± 0.14	8
			p < 0.001^*				p < 0.01^*		p < 0.01^*

^{^}One group, LDim7:5/LDim7:5, remains in T24 LD in Phase 2.
^*Welch’s or Kruskal-Wallis test not assuming equal variances.
Letters indicate significantly different values from all T30 groups (a); from LDim14:10 (b); or from LDim20:10 (c) and from LD10:5 (d). n/d: not determined.

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