condition	mean	min	max
4 h after light	6.4763399999999995	6.39145	6.531569999999999
8 h after light	6.465803333333334	6.38786	6.50494
12 h after light	6.474313333333333	6.388240000000001	6.5674399999999995
4 h after dark	6.468216666666667	6.39353	6.52267
8 h after dark	6.294713333333333	6.24648	6.37666
12 h after dark	6.36473	6.091069999999999	6.56111