condition mean min max ZT0-3 31.216050000000003 31.216050000000003 31.216050000000003 ZT4-7 26.660249999999998 26.660249999999998 26.660249999999998 ZT8-11 27.126199999999997 27.126199999999997 27.126199999999997 ZT12-15 27.06945 27.06945 27.06945 ZT16-19 33.36085 33.36085 33.36085 ZT20-23 28.90305 28.90305 28.90305