condition mean min max ZT0-3 186.33931666666666 64.5863 402.9645 ZT4-7 166.23700000000002 166.23700000000002 166.23700000000002 ZT8-11 26.57965 26.57965 26.57965 ZT12-15 44.176925 37.1757 51.17815 ZT16-19 13.842099999999999 13.842099999999999 13.842099999999999 ZT20-23 17.47135 17.47135 17.47135