condition	mean	min	max
4 h after light	19.8697	18.1284	21.611
8 h after light	17.97905	17.9174	18.0407
12 h after light	19.28685	16.2186	22.3551
4 h after dark	18.57725	17.8444	19.3101
8 h after dark	21.65445	21.4843	21.8246
12 h after dark	20.77965	19.6872	21.8721