condition mean min max ZT0-3 676.507558 676.507558 676.507558 ZT4-7 974.7822894999999 974.7822894999999 974.7822894999999 ZT8-11 975.47777 975.47777 975.47777 ZT12-15 955.372059 955.372059 955.372059 ZT16-19 951.0358214999999 951.0358214999999 951.0358214999999 ZT20-23 775.0921874999999 775.0921874999999 775.0921874999999