condition mean min max ZT0-3 5.450514999999999 5.450514999999999 5.450514999999999 ZT4-7 3.854815 3.854815 3.854815 ZT8-11 3.766625 3.766625 3.766625 ZT12-15 4.142095 4.142095 4.142095 ZT16-19 5.548475 5.548475 5.548475 ZT20-23 5.386025 5.386025 5.386025