condition mean min max ZT0-3 24.579 24.579 24.579 ZT4-7 17.881999999999998 17.881999999999998 17.881999999999998 ZT8-11 16.9732 16.9732 16.9732 ZT12-15 19.6899 19.6899 19.6899 ZT16-19 20.73735 20.73735 20.73735 ZT20-23 27.4036 27.4036 27.4036