condition	mean	min	max
4 h after light	6.642276666666667	6.54095	6.69475
8 h after light	6.73615	6.49921	6.916010000000001
12 h after light	6.71467	6.51326	6.973510000000001
4 h after dark	6.564496666666667	6.33763	6.80665
8 h after dark	6.4323733333333335	6.22705	6.654910000000001
12 h after dark	6.39125	6.27405	6.45784