condition mean min max ZT0-3 166.06574784999998 149.5459464 182.5855493 ZT4-7 84.8749059175 83.57996851 86.169843325 ZT8-11 86.1736353575 75.326121 97.021149715 ZT12-15 74.1698866375 60.076633210000004 88.263140065 ZT16-19 71.92250534749999 66.89463721 76.950373485 ZT20-23 93.57171267 90.432063645 96.711361695