condition	mean	min	max
4 h after light	6.5984533333333335	6.43215	6.8434800000000005
8 h after light	6.452493333333334	6.233630000000001	6.861619999999999
12 h after light	6.3668000000000005	6.11207	6.8159600000000005
4 h after dark	6.288216666666667	6.07225	6.5564100000000005
8 h after dark	6.3490166666666665	6.1212800000000005	6.736619999999999
12 h after dark	6.39355	6.19302	6.70471