condition	mean	min	max
4 h after light	6.0	6.0	6.0
8 h after light	16.5	13.7	19.3
12 h after light	12.55	11.6	13.5
4 h after dark	11.75	11.3	12.2
8 h after dark	7.85	6.2	9.5
12 h after dark	6.0	4.8	7.2