condition mean min max 4 h after light 1.8 1.8 1.8 8 h after light 3.0999999999999996 2.1 4.1 12 h after light 1.7999999999999998 1.2 2.4 4 h after dark 3.9 2.2 5.6 8 h after dark 1.8 1.5 2.1 12 h after dark 1.9 1.3 2.5