condition	mean	min	max
4 h after light	6.5276266666666665	6.37355	6.6050699999999996
8 h after light	6.704266666666667	6.4541900000000005	6.89553
12 h after light	6.648563333333333	6.458559999999999	6.75869
4 h after dark	6.62964	6.39233	6.92754
8 h after dark	6.572033333333334	6.3441	6.7351399999999995
12 h after dark	6.34792	6.21167	6.5641300000000005