condition mean min max ZT0-3 25.96485 25.96485 25.96485 ZT4-7 19.25365 19.25365 19.25365 ZT8-11 20.408749999999998 20.408749999999998 20.408749999999998 ZT12-15 18.3366 18.3366 18.3366 ZT16-19 29.0891 29.0891 29.0891 ZT20-23 27.92135 27.92135 27.92135