condition	mean	min	max
4 h after light	6.788673333333334	6.77429	6.80725
8 h after light	6.79328	6.599660000000001	6.946110000000001
12 h after light	6.891603333333333	6.6745	7.217980000000001
4 h after dark	6.7679	6.56232	6.9525
8 h after dark	6.646116666666667	6.43852	6.77875
12 h after dark	6.727989999999999	6.65565	6.851889999999999