condition mean min max ZT0-3 34.734049999999996 31.5734 37.8947 ZT4-7 28.1356 28.1356 28.1356 ZT8-11 25.1604 25.1604 25.1604 ZT12-15 28.89411666666667 26.003333333333334 31.7849 ZT16-19 35.8221 35.8221 35.8221 ZT20-23 35.3731 35.3731 35.3731