Table 1.

Characteristics of daily torpor in female ICR (CD-1) laboratory mice exposed to varying foraging conditions. Summary data per group are given as means and s.d. Zero or n/a indicates that an animal did not show torpor.

mouse number	group	days scored (no.)	average active phase temperature (°C)	average resting phase temperature (°C)	torpor incidence (0/1)a	total torpor bouts (no.)	average bout duration (min)	average low torpor temperature (°C)b	record low torpor temperature (°C)c
3	L	28	37.0	35.9	0	0	n/a	n/a	n/a
8	L	29	37.0	33.9	1	8	416.5	24.9	23.5
12	L	16	35.2	34.8	0	0	n/a	n/a	n/a
18	L	29	37.3	33.0	1	29	228.9	27.6	21.9
22	L	29	36.4	35.2	0	0	n/a	n/a	n/a
6	H	29	37.5	34.5	1	13	323.7	27.7	21.9
7	H	29	38.2	37.3	1	2	282.5	28.4	28.3
11	H	19	35.3	33.4	1	3	416.7	22.2	21.0
17	H	29	36.5	33.3	1	10	340.5	25.7	24.7
2	N	21	37.4	35.8	0	0	n/a	n/a	n/a
4	N	20	36.6	35.0	1	13	188.9	29.5	27.2
9	N	20	37.5	35.8	0	0	n/a	n/a	n/a
10	N	24	37.4	35.8	1	5	191.2	27.4	23.6
16	N	19	37.1	35.6	0	0	n/a	n/a	n/a
21	N	19	37.5	36.2	0	0	n/a	n/a	n/a
low-cost group (L)		25.9 (5.5)	36.9 (0.9)	35.0 (1.1)	0.4 (0.5)	7.4 (12.6)	322.7 (132.7)	26.2 (14.4)	22.7 (12.4)
high-cost group (H)		26.1 (4.8)	36.9 (1.3)	34.6 (1.8)	1.0 (0.0)	7.0 (5.4)	340.8 (56.1)	26.0 (2.8)	24.0 (3.3)
no-cost group (N)		20.5 (1.9)	37.2 (0.4)	35.7 (0.4)	0.3 (0.5)	3.0 (5.3)	190.1 (98.1)	28.4 (14.7)	25.4 (13.2)

^a0, no torpor; 1, torpor.

^bIndividual average of the lowest temperature typically reached by the end of torpor bout.

^cIndividual record of the single lowest temperature ever reached during a torpor bout.