condition mean min max 4 h after light 1.7 1.7 1.7 8 h after light 2.65 2.4 2.9 12 h after light 2.7 2.0 3.4 4 h after dark 1.9500000000000002 1.8 2.1 8 h after dark 6.55 3.6 9.5 12 h after dark 1.95 1.0 2.9