condition mean min max ZT0-3 0.73460525 0.5142825 0.954928 ZT4-7 0.5825075 0.5825075 0.5825075 ZT8-11 0.7678619999999999 0.7678619999999999 0.7678619999999999 ZT12-15 0 0 0 ZT16-19 0.696221 0.696221 0.696221 ZT20-23 1.333955 1.333955 1.333955