condition mean min max ZT0-3 1.42752014875 0.864310293 1.9907300045 ZT4-7 5.78617010175 4.468002253 7.1043379505 ZT8-11 10.89887269425 9.9056605335 11.892084855 ZT12-15 17.9206815025 15.381858489999999 20.459504515 ZT16-19 27.59162178 23.799033275 31.384210285 ZT20-23 39.8273972475 34.155297145 45.49949735