condition	mean	min	max
4 h after light	7.058066666666666	6.673139999999999	7.289839999999999
8 h after light	7.2087433333333335	7.1935	7.22485
12 h after light	7.2412399999999995	7.12073	7.32562
4 h after dark	7.266596666666667	7.21697	7.32837
8 h after dark	7.23208	7.15322	7.320289999999999
12 h after dark	7.2899	7.19723	7.42903