condition mean min max ZT0-3 5.1711521742499995 1.868881466 8.4734228825 ZT4-7 18.9279779875 14.391491385 23.46446459 ZT8-11 29.71026725 26.410652135 33.009882365 ZT12-15 28.976924425 27.054782015 30.899066835 ZT16-19 30.159335005 25.792516815 34.526153195 ZT20-23 60.162013725 48.021129085 72.302898365