condition mean min max 0 h after light 0.976907 0.944524 1.00929 4 h after light 1.8678 1.49 2.2456 8 h after light 2.21012 2.11523 2.30501 4 h after dark 1.54925 1.48423 1.61427 8 h after dark 1.620255 1.36435 1.87616 12 h after dark 1.365635 1.13191 1.59936