condition	mean	min	max
4 h after light	2.0	2.0	2.0
8 h after light	8.65	2.4	14.9
12 h after light	16.2	14.1	18.3
4 h after dark	19.65	19.6	19.7
8 h after dark	3.85	1.2	6.5
12 h after dark	5.75	4.9	6.6