condition	mean	min	max
4 h after light	6.47124	6.374630000000001	6.56527
8 h after light	6.61444	6.5172099999999995	6.674810000000001
12 h after light	6.48181	6.2697	6.66684
4 h after dark	6.37282	6.17047	6.559089999999999
8 h after dark	6.263493333333334	6.1779	6.34638
12 h after dark	5.968756666666667	5.94232	5.98266