condition mean min max 0 h after light 2.749285 2.05967 3.4389 4 h after light 5.97331 4.27502 7.6716 8 h after light 17.3876 15.8124 18.9628 4 h after dark 11.549150000000001 11.5378 11.5605 8 h after dark 8.776955000000001 8.16263 9.39128 12 h after dark 3.593655 1.52363 5.66368