condition mean min max ZT0-3 2214.906349 2214.906349 2214.906349 ZT4-7 1931.6233595 1931.6233595 1931.6233595 ZT8-11 1910.0060210000001 1910.0060210000001 1910.0060210000001 ZT12-15 2271.848513 2271.848513 2271.848513 ZT16-19 1883.3654930000002 1883.3654930000002 1883.3654930000002 ZT20-23 1492.719321 1492.719321 1492.719321