condition mean min max 4 h after light 95.0 95.0 95.0 8 h after light 79.0 79.0 79.0 12 h after light 80.9 51.2 110.6 4 h after dark 79.9 72.3 87.5 8 h after dark 75.0 66.2 83.8 12 h after dark 55.0 44.7 65.3