condition mean min max ZT0-3 28.5836 28.5836 28.5836 ZT4-7 24.8795 24.8795 24.8795 ZT8-11 19.92725 19.92725 19.92725 ZT12-15 22.27435 22.27435 22.27435 ZT16-19 27.3672 27.3672 27.3672 ZT20-23 30.314700000000002 30.314700000000002 30.314700000000002