condition mean min max ZT0-3 121.586523 121.586523 121.586523 ZT4-7 72.1077815 72.1077815 72.1077815 ZT8-11 90.361696 90.361696 90.361696 ZT12-15 70.33866499999999 70.33866499999999 70.33866499999999 ZT16-19 76.1195465 76.1195465 76.1195465 ZT20-23 81.85205049999999 81.85205049999999 81.85205049999999