condition mean min max 4 h after light 2.0 2.0 2.0 8 h after light 27.5 16.5 38.5 12 h after light 7.5 6.6 8.4 4 h after dark 6.15 3.9 8.4 8 h after dark 4.2 3.1 5.3 12 h after dark 2.45 2.2 2.7