condition	mean	min	max
4 h after light	6.558966666666667	6.4413599999999995	6.643730000000001
8 h after light	6.4148266666666665	6.29122	6.64076
12 h after light	6.644196666666667	6.26623	6.942130000000001
4 h after dark	6.3344000000000005	6.12228	6.60348
8 h after dark	6.356446666666667	6.059159999999999	6.68655
12 h after dark	6.589829999999999	6.50231	6.642639999999999