condition	mean	min	max
4 h after light	6.374736666666667	6.1483300000000005	6.62365
8 h after light	6.614836666666666	6.32744	6.9607399999999995
12 h after light	6.602936666666667	6.31073	6.82195
4 h after dark	6.799616666666667	6.62833	7.09934
8 h after dark	6.900510000000001	6.48016	7.512160000000001
12 h after dark	6.779850000000001	6.4896400000000005	6.9403