condition mean min max ZT0-3 610.233614 610.233614 610.233614 ZT4-7 461.588999 461.588999 461.588999 ZT8-11 522.1097035 522.1097035 522.1097035 ZT12-15 550.0844824999999 550.0844824999999 550.0844824999999 ZT16-19 606.9397345 606.9397345 606.9397345 ZT20-23 679.120193 679.120193 679.120193