condition	mean	min	max
4 h after light	2.4	2.4	2.4
8 h after light	3.2	2.7	3.7
12 h after light	3.2	2.7	3.7
4 h after dark	16.75	12.8	20.7
8 h after dark	4.55	2.3	6.8
12 h after dark	2.55	2.4	2.7