condition	mean	min	max
4 h after light	19.48995	17.1305	21.8494
8 h after light	16.4199	14.9908	17.849
12 h after light	15.8284	15.7437	15.9131
4 h after dark	18.0689	17.1208	18.5822
8 h after dark	20.45243333333333	19.2673	21.8589
12 h after dark	18.749200000000002	17.9155	19.6878