condition mean min max 0 h after light 5.985945 5.82418 6.14771 4 h after light 1.43558 0.0 2.87116 8 h after light 1.440535 0.0 2.88107 4 h after dark 4.30702 0.0 8.61404 8 h after dark 2.96809 2.86805 3.06813 12 h after dark 3.12639 2.90818 3.3446