condition mean min max ZT0-3 15.023023832500002 12.968764495 17.07728317 ZT4-7 12.164801925 11.6898543 12.639749550000001 ZT8-11 11.6457990175 11.379340845 11.91225719 ZT12-15 17.686070389999998 15.503048355 19.869092424999998 ZT16-19 15.49292837 15.10072816 15.88512858 ZT20-23 12.791183660000002 11.694620700000002 13.887746620000001