condition mean min max ZT0-3 63.60532841 62.12347338 65.08718344 ZT4-7 61.1566581 54.509436793333336 67.80387940666667 ZT8-11 61.01910389 60.43592802 61.60227976 ZT12-15 64.81954888833334 64.33005928 65.30903849666667 ZT16-19 54.496020605 48.33658629 60.655454920000004 ZT20-23 58.71858015666666 47.688187613333334 69.7489727