condition mean min max ZT0-3 4.9021625 4.82631 4.978015 ZT4-7 3.84478 3.84478 3.84478 ZT8-11 4.81792 4.81792 4.81792 ZT12-15 0 0 0 ZT16-19 5.5742449999999995 5.5742449999999995 5.5742449999999995 ZT20-23 4.55664 4.55664 4.55664