condition mean min max ZT0-3 21.4592 21.4592 21.4592 ZT4-7 20.82555 20.82555 20.82555 ZT8-11 13.25895 13.25895 13.25895 ZT12-15 13.297699999999999 13.297699999999999 13.297699999999999 ZT16-19 19.1798 19.1798 19.1798 ZT20-23 20.8542 20.8542 20.8542