condition	mean	min	max
4 h after light	4.0	4.0	4.0
8 h after light	3.35	3.1	3.6
12 h after light	21.55	14.6	28.5
4 h after dark	6.05	5.0	7.1
8 h after dark	4.15	4.1	4.2
12 h after dark	3.05	2.0	4.1