condition mean min max 4 h after light 5.9 5.9 5.9 8 h after light 2.5999999999999996 2.3 2.9 12 h after light 6.55 6.3 6.8 4 h after dark 3.3 1.9 4.7 8 h after dark 20.75 18.6 22.9 12 h after dark 2.25 2.2 2.3