condition mean min max ZT0-3 1.3307775 1.1559599999999999 1.505595 ZT4-7 2.31191 2.31191 2.31191 ZT8-11 1.92719 1.92719 1.92719 ZT12-15 0 0 0 ZT16-19 2.09686 2.09686 2.09686 ZT20-23 1.69254 1.69254 1.69254