condition mean min max 4 h after light 2.9 2.9 2.9 8 h after light 7.4 5.5 9.3 12 h after light 2.4000000000000004 2.1 2.7 4 h after dark 1.9 1.4 2.4 8 h after dark 4.55 1.7 7.4 12 h after dark 6.050000000000001 5.2 6.9