condition mean min max ZT0-3 19.1403783775 12.66106314 25.619693615000003 ZT4-7 33.710656495 31.65963083 35.76168216 ZT8-11 32.6615875075 32.0513694 33.271805615 ZT12-15 37.054150855 34.66440432 39.443897390000004 ZT16-19 38.097174325 36.127423255 40.066925395 ZT20-23 33.480078809999995 33.35545357 33.604704049999995