condition	mean	min	max
4 h after light	6.98966	6.93352	7.02953
8 h after light	7.0988766666666665	6.954560000000001	7.22098
12 h after light	7.063106666666666	6.972810000000001	7.141489999999999
4 h after dark	6.99739	6.90947	7.1581600000000005
8 h after dark	6.958483333333334	6.75472	7.149030000000001
12 h after dark	6.871456666666667	6.71985	6.9652