condition mean min max ZT0-3 7.9442693455 6.295812474 9.592726217000001 ZT4-7 12.4721489575 12.305982205 12.63831571 ZT8-11 14.033742907499999 10.52282527 17.544660545 ZT12-15 18.9304746325 18.725628105 19.13532116 ZT16-19 14.0336811975 13.634701145000001 14.432661249999999 ZT20-23 12.3544932475 11.85581789 12.853168605