condition	mean	min	max
0 h after light	8.88417	8.71614	9.0522
4 h after light	8.97993	8.75277	9.20709
8 h after light	18.14595	17.8015	18.4904
4 h after dark	16.32285	15.7594	16.8863
8 h after dark	8.883635	8.37117	9.3961
12 h after dark	7.5886	7.12416	8.05304