condition mean min max ZT0-3 0.346607997 0.0001231955 0.688894 ZT4-7 0.973357 0.973357 0.973357 ZT8-11 1.1648495 1.1648495 1.1648495 ZT12-15 3.108535 2.527475 3.6895949999999997 ZT16-19 1.675645 1.675645 1.675645 ZT20-23 2.154565 2.154565 2.154565