condition mean min max ZT0-3 1.2771314999999999 1.2771314999999999 1.2771314999999999 ZT4-7 1.1302745 1.1302745 1.1302745 ZT8-11 2.08655 2.08655 2.08655 ZT12-15 1.6014 1.6014 1.6014 ZT16-19 2.5603 2.5603 2.5603 ZT20-23 1.17326 1.17326 1.17326