condition mean min max ZT0-3 56.879616666666664 22.96925 74.57204999999999 ZT4-7 17.256050000000002 17.256050000000002 17.256050000000002 ZT8-11 15.654150000000001 15.654150000000001 15.654150000000001 ZT12-15 22.017075 16.87275 27.1614 ZT16-19 38.54835 38.54835 38.54835 ZT20-23 69.3237 69.3237 69.3237