condition mean min max ZT0-3 4.899749999999999 4.710755 5.088744999999999 ZT4-7 6.071289999999999 6.071289999999999 6.071289999999999 ZT8-11 6.254655 6.254655 6.254655 ZT12-15 0 0 0 ZT16-19 5.696145 5.696145 5.696145 ZT20-23 6.6075800000000005 6.6075800000000005 6.6075800000000005