condition	mean	min	max
4 h after light	6.513926666666666	6.25393	6.753419999999999
8 h after light	6.68058	6.51414	6.88817
12 h after light	6.4886099999999995	6.3533599999999995	6.636489999999999
4 h after dark	6.71598	6.5330900000000005	6.87379
8 h after dark	6.6101	6.49327	6.742999999999999
12 h after dark	6.6350299999999995	6.58068	6.68232