condition	mean	min	max
4 h after light	6.834036666666667	6.79056	6.90578
8 h after light	6.740670000000001	6.643680000000001	6.80122
12 h after light	6.752973333333333	6.57735	6.959230000000001
4 h after dark	6.87116	6.788939999999999	7.0122800000000005
8 h after dark	6.89457	6.82505	6.987419999999999
12 h after dark	7.02449	6.91713	7.137169999999999