condition	mean	min	max
4 h after light	4.0	4.0	4.0
8 h after light	2.4	1.9	2.9
12 h after light	4.95	3.2	6.7
4 h after dark	4.75	3.1	6.4
8 h after dark	2.0	1.9	2.1
12 h after dark	5.05	2.9	7.2