condition mean min max ZT0-3 18.32511 18.32511 18.32511 ZT4-7 18.32159 18.32159 18.32159 ZT8-11 21.305199 21.305199 21.305199 ZT12-15 15.1884415 15.1884415 15.1884415 ZT16-19 13.460898499999999 13.460898499999999 13.460898499999999 ZT20-23 14.2089595 14.2089595 14.2089595