condition	mean	min	max
4 h after light	1.9	1.9	1.9
8 h after light	8.4	4.4	12.4
12 h after light	19.5	16.1	22.9
4 h after dark	21.5	16.8	26.2
8 h after dark	5.9	2.8	9.0
12 h after dark	15.3	15.2	15.4