condition	mean	min	max
4 h after light	7.2	7.2	7.2
8 h after light	5.0	4.1	5.9
12 h after light	11.75	11.4	12.1
4 h after dark	2.95	2.7	3.2
8 h after dark	4.7	3.4	6.0
12 h after dark	6.25	5.3	7.2