condition	mean	min	max
4 h after light	2.3	2.3	2.3
8 h after light	3.7	2.6	4.8
12 h after light	2.5	2.4	2.6
4 h after dark	3.2	2.2	4.2
8 h after dark	4.0	3.3	4.7
12 h after dark	2.3	1.9	2.7