condition mean min max ZT0-3 3.51982 3.51982 3.51982 ZT4-7 2.02603 2.02603 2.02603 ZT8-11 2.037775 2.037775 2.037775 ZT12-15 1.657355 1.657355 1.657355 ZT16-19 1.32619 1.32619 1.32619 ZT20-23 2.47654 2.47654 2.47654