condition mean min max ZT0-3 35.207049999999995 34.5734 35.8407 ZT4-7 20.6378 20.6378 20.6378 ZT8-11 15.322949999999999 15.322949999999999 15.322949999999999 ZT12-15 0 0 0 ZT16-19 28.002650000000003 28.002650000000003 28.002650000000003 ZT20-23 32.60665 32.60665 32.60665