condition mean min max ZT0-3 10.8437008765 9.566707232999999 12.12069452 ZT4-7 11.99452823 9.47073797 14.51831849 ZT8-11 19.6665127725 16.628679325 22.704346219999998 ZT12-15 17.593137917500002 15.71420037 19.472075465 ZT16-19 19.729727422499998 17.415581279999998 22.043873565 ZT20-23 25.552247072500002 24.064902215 27.03959193