condition mean min max 4 h after light 1.8 1.8 1.8 8 h after light 1.6 1.4 1.8 12 h after light 4.199999999999999 3.3 5.1 4 h after dark 3.65 2.3 5.0 8 h after dark 2.3 2.2 2.4 12 h after dark 5.8 5.1 6.5