condition	mean	min	max
4 h after light	7.106343333333333	6.81906	7.3981
8 h after light	7.15096	6.6166100000000005	7.49511
12 h after light	6.97585	6.74534	7.1701
4 h after dark	6.90251	6.5231	7.123819999999999
8 h after dark	6.946256666666667	6.678939999999999	7.08435
12 h after dark	6.68882	6.61377	6.785069999999999