condition mean min max ZT0-3 4.723601666666666 4.0581499999999995 5.44785 ZT4-7 2.57768 2.57768 2.57768 ZT8-11 1.37148 1.37148 1.37148 ZT12-15 1.35887 1.300055 1.417685 ZT16-19 2.385525 2.385525 2.385525 ZT20-23 3.31866 3.31866 3.31866