condition mean min max 4 h after light 4.3 4.3 4.3 8 h after light 6.2 2.5 9.9 12 h after light 7.85 7.2 8.5 4 h after dark 4.25 3.4 5.1 8 h after dark 3.5500000000000003 2.2 4.9 12 h after dark 3.7 3.6 3.8