condition mean min max 4 h after light 99.4 99.4 99.4 8 h after light 119.30000000000001 99.8 138.8 12 h after light 84.9 72.0 97.8 4 h after dark 61.4 49.2 73.6 8 h after dark 68.69999999999999 47.8 89.6 12 h after dark 41.5 18.2 64.8