condition	mean	min	max
4 h after light	15.3535375	14.865666	15.841409
8 h after light	16.8226245	15.505954	18.139295
12 h after light	18.1493725	16.341231	19.957514
4 h after dark	19.9723815	19.093834	20.850929
8 h after dark	21.250697	20.872618	21.628776
12 h after dark	18.605388	18.605388	18.605388