condition	mean	min	max
4 h after light	19.40615	19.0737	19.7386
8 h after light	20.4189	20.3093	20.5285
12 h after light	15.98895	14.4296	17.5483
4 h after dark	21.8674	18.3736	27.8721
8 h after dark	19.916466666666665	17.6222	21.142
12 h after dark	15.9979	13.2153	18.424