condition mean min max ZT0-3 25.8959 14.1741 34.03155 ZT4-7 16.45495 16.45495 16.45495 ZT8-11 20.01475 20.01475 20.01475 ZT12-15 26.2637 24.631149999999998 27.896250000000002 ZT16-19 33.6439 33.6439 33.6439 ZT20-23 40.2648 40.2648 40.2648