condition mean min max 4 h after light 2.1 2.1 2.1 8 h after light 1.6500000000000001 1.1 2.2 12 h after light 8.75 1.0 16.5 4 h after dark 2.0 1.5 2.5 8 h after dark 5.6 3.2 8.0 12 h after dark 12.0 0.6 23.4