condition	mean	min	max
4 h after light	6.926433333333334	6.88915	6.97968
8 h after light	6.919153333333333	6.9008199999999995	6.949660000000001
12 h after light	6.9532766666666666	6.8662	7.0384
4 h after dark	6.8042	6.715260000000001	6.8726199999999995
8 h after dark	6.882383333333333	6.839930000000001	6.94499
12 h after dark	6.93149	6.91343	6.95273