condition mean min max ZT0-3 57.898633333333336 44.1472 67.1196 ZT4-7 32.569250000000004 32.569250000000004 32.569250000000004 ZT8-11 27.5178 27.5178 27.5178 ZT12-15 32.56655 31.460250000000002 33.67285 ZT16-19 36.75495 36.75495 36.75495 ZT20-23 67.47285 67.47285 67.47285