condition mean min max 4 h after light 2.3 2.3 2.3 8 h after light 2.1500000000000004 1.1 3.2 12 h after light 2.1500000000000004 1.1 3.2 4 h after dark 2.9 2.0 3.8 8 h after dark 4.7 2.6 6.8 12 h after dark 3.1 1.7 4.5