condition mean min max ZT0-3 24.525635 24.525635 24.525635 ZT4-7 23.0255255 23.0255255 23.0255255 ZT8-11 25.360976 25.360976 25.360976 ZT12-15 18.0950055 18.0950055 18.0950055 ZT16-19 31.145598999999997 31.145598999999997 31.145598999999997 ZT20-23 28.2731765 28.2731765 28.2731765