condition	mean	min	max
4 h after light	6.4098033333333335	6.29228	6.49782
8 h after light	6.383126666666667	6.14225	6.5487400000000004
12 h after light	6.279803333333334	6.19186	6.4442699999999995
4 h after dark	6.4228266666666665	5.9004900000000005	6.85575
8 h after dark	6.441879999999999	6.1987	6.79017
12 h after dark	6.09885	5.97831	6.23273