condition mean min max ZT0-3 77.3603202425 53.082118885 101.63852159999999 ZT4-7 16.8708444275 14.08248829 19.659200565 ZT8-11 8.7975943595 8.4915486145 9.103640104499998 ZT12-15 8.097037102000002 7.683900250500001 8.5101739535 ZT16-19 11.575771687 9.719697579 13.431845795000001 ZT20-23 17.690618065000002 17.0176609 18.363575230000002