condition mean min max ZT0-3 40.80421666666667 24.8105 53.36095 ZT4-7 21.82815 21.82815 21.82815 ZT8-11 18.6445 18.6445 18.6445 ZT12-15 25.268250000000002 23.94115 26.59535 ZT16-19 32.913399999999996 32.913399999999996 32.913399999999996 ZT20-23 46.707499999999996 46.707499999999996 46.707499999999996