condition mean min max ZT0-3 36.7476619025 32.484734294999996 41.01058951 ZT4-7 55.59937592 50.36525696333334 60.83349487666667 ZT8-11 59.651327499999994 58.0725293 61.230125699999995 ZT12-15 61.928156369999996 58.809833346666665 65.04647939333333 ZT16-19 64.16758178166667 62.346643713333336 65.98851985 ZT20-23 64.38494421666667 60.51430969333333 68.25557874