condition mean min max ZT0-3 114.54933333333334 109.8475 120.84049999999999 ZT4-7 71.45904999999999 71.45904999999999 71.45904999999999 ZT8-11 20.09055 20.09055 20.09055 ZT12-15 26.320925 20.5353 32.10655 ZT16-19 23.806800000000003 23.806800000000003 23.806800000000003 ZT20-23 69.76975 69.76975 69.76975