condition mean min max ZT0-3 6.397242499999999 5.64488 7.149604999999999 ZT4-7 14.85135 14.85135 14.85135 ZT8-11 18.7106 18.7106 18.7106 ZT12-15 0 0 0 ZT16-19 11.5981 11.5981 11.5981 ZT20-23 15.27495 15.27495 15.27495