condition	mean	min	max
4 h after light	8.711966666666667	8.62087	8.830860000000001
8 h after light	8.69692	8.509739999999999	8.96551
12 h after light	8.887126666666667	8.65421	9.12493
4 h after dark	8.814820000000001	8.52168	9.1592
8 h after dark	8.660103333333334	8.35435	9.07437
12 h after dark	8.50479	8.10125	8.74007