condition	mean	min	max
4 h after light	6.621036666666667	6.4284300000000005	6.80921
8 h after light	6.5404800000000005	6.42532	6.68792
12 h after light	6.671476666666666	6.34842	6.967039999999999
4 h after dark	6.621793333333334	6.27939	7.0361
8 h after dark	6.58702	6.48423	6.7255199999999995
12 h after dark	6.530096666666667	5.98977	6.851660000000001