condition mean min max 4 h after light 2.1 2.1 2.1 8 h after light 6.300000000000001 2.8 9.8 12 h after light 2.5 1.8 3.2 4 h after dark 2.8 1.5 4.1 8 h after dark 5.1 2.4 7.8 12 h after dark 2.15 1.5 2.8