condition	mean	min	max
4 h after light	3.5	3.5	3.5
8 h after light	2.5	2.2	2.8
12 h after light	2.2	2.2	2.2
4 h after dark	3.75	3.4	4.1
8 h after dark	3.75	3.5	4.0
12 h after dark	2.55	2.4	2.7