condition	mean	min	max
4 h after light	6.585873333333334	6.4223300000000005	6.79995
8 h after light	6.481556666666666	6.36111	6.5666899999999995
12 h after light	6.479376666666667	6.20529	6.70176
4 h after dark	6.7095199999999995	6.495369999999999	6.8236
8 h after dark	6.566273333333333	6.20887	6.851389999999999
12 h after dark	6.6865	6.47052	6.88163