condition mean min max 4 h after light 89.8 89.8 89.8 8 h after light 89.25 88.0 90.5 12 h after light 102.4 96.9 107.9 4 h after dark 142.5 137.8 147.2 8 h after dark 134.0 111.4 156.6 12 h after dark 134.35 132.2 136.5