condition	mean	min	max
0 h after light	19.25965	18.5803	19.939
4 h after light	9.280445	9.17488	9.38601
8 h after light	7.775585	7.36758	8.18359
4 h after dark	19.7487	18.9221	20.5753
8 h after dark	18.18775	18.0642	18.3113
12 h after dark	16.9446	15.9777	17.9115