condition mean min max ZT0-3 130.68553775 130.2886961 131.0823794 ZT4-7 90.2466636975 85.10934724 95.38398015499999 ZT8-11 157.7431315625 119.95843267499998 195.52783045 ZT12-15 153.6592115 128.38802025 178.93040274999998 ZT16-19 140.29471754999997 128.8304221 151.75901299999998 ZT20-23 115.1616853875 109.00582417499999 121.3175466