condition mean min max ZT0-3 31.406876 31.406876 31.406876 ZT4-7 36.720544 36.720544 36.720544 ZT8-11 42.534733 42.534733 42.534733 ZT12-15 36.6482125 36.6482125 36.6482125 ZT16-19 67.205273 67.205273 67.205273 ZT20-23 68.389792 68.389792 68.389792