condition mean min max ZT0-3 0.6024975 0.5514 0.653595 ZT4-7 1.66732 1.66732 1.66732 ZT8-11 1.2127685000000001 1.2127685000000001 1.2127685000000001 ZT12-15 0 0 0 ZT16-19 1.4101599999999999 1.4101599999999999 1.4101599999999999 ZT20-23 1.3060925 1.3060925 1.3060925