condition	mean	min	max
4 h after light	6.333360000000001	6.2266900000000005	6.5060400000000005
8 h after light	6.241256666666667	6.22432	6.2575
12 h after light	6.271506666666667	6.22051	6.35378
4 h after dark	6.3335799999999995	6.28845	6.398569999999999
8 h after dark	6.264333333333333	6.18449	6.3578
12 h after dark	6.252283333333334	6.13845	6.4021300000000005