condition mean min max 0 h after light 3.51544 3.31177 3.71911 4 h after light 3.01511 2.73686 3.29336 8 h after light 2.897765 2.55894 3.23659 4 h after dark 3.066525 2.92008 3.21297 8 h after dark 2.843655 2.8045 2.88281 12 h after dark 2.6831 2.33852 3.02768