condition mean min max 4 h after light 4.9 4.9 4.9 8 h after light 1.65 1.5 1.8 12 h after light 8.3 4.2 12.4 4 h after dark 11.6 2.8 20.4 8 h after dark 10.549999999999999 2.2 18.9 12 h after dark 1.1 1.0 1.2