condition mean min max ZT0-3 14.203295257499999 12.898638904999999 15.50795161 ZT4-7 7.4258652775 7.0985985885 7.7531319665 ZT8-11 4.574216079999999 3.8335718864999997 5.314860273499999 ZT12-15 2.17748416225 2.009572234 2.3453960905 ZT16-19 3.1812518475 2.4102061175 3.9522975775 ZT20-23 7.06966232275 6.1321403850000005 8.0071842605