condition	mean	min	max
4 h after light	6.572733333333334	6.48417	6.65493
8 h after light	6.55937	6.49461	6.688460000000001
12 h after light	6.518	6.40501	6.60508
4 h after dark	6.601603333333333	6.43994	6.69643
8 h after dark	6.55265	6.39267	6.672789999999999
12 h after dark	6.611426666666667	6.4634	6.8003