condition	mean	min	max
4 h after light	1.9	1.9	1.9
8 h after light	14.0	7.0	21.0
12 h after light	9.45	3.0	15.9
4 h after dark	7.75	7.4	8.1
8 h after dark	19.85	18.0	21.7
12 h after dark	4.4	3.9	4.9