condition mean min max ZT0-3 17.53233278475 9.2746402395 25.79002533 ZT4-7 11.76899734575 11.1650717165 12.372922975 ZT8-11 12.782826908 11.102261975000001 14.463391841 ZT12-15 24.000043865 21.125064445 26.875023284999997 ZT16-19 25.42338926 25.002131130000002 25.84464739 ZT20-23 25.23748816 24.533744685000002 25.941231635