condition mean min max ZT0-3 0.27324375 0.090871 0.4556165 ZT4-7 1.1005829999999999 1.1005829999999999 1.1005829999999999 ZT8-11 1.7234639999999999 1.7234639999999999 1.7234639999999999 ZT12-15 0 0 0 ZT16-19 0.5379685 0.5379685 0.5379685 ZT20-23 0.900704 0.900704 0.900704