condition mean min max 4 h after light 3.2198 2.89397 3.54563 8 h after light 3.764735 3.41322 4.11625 12 h after light 3.574345 3.47071 3.67798 4 h after dark 5.284525 4.69976 5.86929 8 h after dark 5.31374 5.29024 5.33724 12 h after dark 4.485605 4.24589 4.72532