condition	mean	min	max
4 h after light	6.620686666666667	6.4038699999999995	6.80757
8 h after light	6.916206666666667	6.695239999999999	7.193980000000001
12 h after light	6.54505	6.44602	6.717689999999999
4 h after dark	6.3868100000000005	6.29804	6.45955
8 h after dark	6.399163333333333	6.15636	6.54997
12 h after dark	6.12209	5.81991	6.3388