condition	mean	min	max
4 h after light	6.55723	6.4442699999999995	6.700539999999999
8 h after light	6.582513333333333	6.49059	6.74315
12 h after light	6.540273333333333	6.44855	6.62506
4 h after dark	6.65906	6.57988	6.801819999999999
8 h after dark	6.683096666666667	6.43441	6.828869999999999
12 h after dark	6.555610000000001	6.38936	6.705260000000001