condition	mean	min	max
4 h after light	6.31592	6.0974699999999995	6.6353800000000005
8 h after light	6.40338	6.12675	6.63588
12 h after light	6.293266666666667	6.1765099999999995	6.50403
4 h after dark	6.45585	6.21413	6.81446
8 h after dark	6.394476666666667	6.017440000000001	6.833089999999999
12 h after dark	6.472106666666667	6.39007	6.60002