condition mean min max ZT0-3 4.515572499999999 4.18162 4.849525 ZT4-7 4.86753 4.86753 4.86753 ZT8-11 3.9558350000000004 3.9558350000000004 3.9558350000000004 ZT12-15 0 0 0 ZT16-19 3.27778 3.27778 3.27778 ZT20-23 7.489635 7.489635 7.489635