condition mean min max ZT0-3 3.5220124999999998 3.513185 3.53084 ZT4-7 2.054448 2.054448 2.054448 ZT8-11 1.7323650000000002 1.7323650000000002 1.7323650000000002 ZT12-15 0 0 0 ZT16-19 2.849595 2.849595 2.849595 ZT20-23 4.93525 4.93525 4.93525