condition	mean	min	max
4 h after light	7.1161	7.067830000000001	7.16028
8 h after light	7.055506666666667	6.88693	7.285710000000001
12 h after light	7.039036666666667	7.027010000000001	7.055219999999999
4 h after dark	7.194373333333333	6.9153199999999995	7.3808
8 h after dark	7.046646666666667	6.899789999999999	7.28458
12 h after dark	7.15899	7.04223	7.30863