condition	mean	min	max
4 h after light	5.2	5.2	5.2
8 h after light	5.2	5.2	5.2
12 h after light	3.6	3.5	3.7
4 h after dark	4.9	3.8	6.0
8 h after dark	3.5	3.3	3.7
12 h after dark	3.3	3.2	3.4