condition mean min max ZT0-3 29.84825 29.84825 29.84825 ZT4-7 20.2526 20.2526 20.2526 ZT8-11 33.3911 33.3911 33.3911 ZT12-15 48.873799999999996 48.873799999999996 48.873799999999996 ZT16-19 28.60125 28.60125 28.60125 ZT20-23 26.850749999999998 26.850749999999998 26.850749999999998