condition mean min max ZT0-3 13.416233333333334 13.17135 13.64825 ZT4-7 13.2643 13.2643 13.2643 ZT8-11 17.64715 17.64715 17.64715 ZT12-15 22.541075 21.5396 23.54255 ZT16-19 18.16135 18.16135 18.16135 ZT20-23 17.696550000000002 17.696550000000002 17.696550000000002