condition	mean	min	max
4 h after light	3.5	3.5	3.5
8 h after light	2.95	2.9	3.0
12 h after light	3.6	3.5	3.7
4 h after dark	5.35	4.7	6.0
8 h after dark	5.0	4.3	5.7
12 h after dark	4.05	3.5	4.6