condition mean min max 4 h after light 5.9 5.9 5.9 8 h after light 2.55 1.5 3.6 12 h after light 4.4 3.8 5.0 4 h after dark 1.2999999999999998 1.2 1.4 8 h after dark 18.9 6.6 31.2 12 h after dark 4.4 1.8 7.0