condition	mean	min	max
4 h after light	7.928403333333333	7.8284	8.09714
8 h after light	7.839636666666666	7.77427	7.8861
12 h after light	7.868036666666667	7.5954	8.0971
4 h after dark	7.76953	7.626010000000001	8.005289999999999
8 h after dark	7.64716	7.4676800000000005	7.837619999999999
12 h after dark	7.75918	7.58055	7.86313