condition	mean	min	max
4 h after light	17.7134	17.3709	18.0559
8 h after light	8.07996	7.92571	8.23421
12 h after light	6.588155	6.12968	7.04663
4 h after dark	11.4435	11.3458	11.5412
8 h after dark	14.9968	14.9472	15.0464
12 h after dark	16.525	16.322	16.728