condition mean min max 4 h after light 6.3 6.3 6.3 8 h after light 6.75 5.7 7.8 12 h after light 2.9 2.5 3.3 4 h after dark 8.9 5.3 12.5 8 h after dark 5.449999999999999 2.7 8.2 12 h after dark 2.4 2.3 2.5