condition mean min max ZT0-3 15.3897 14.481449999999999 16.29795 ZT4-7 14.527350000000002 14.527350000000002 14.527350000000002 ZT8-11 14.375049999999998 14.375049999999998 14.375049999999998 ZT12-15 0 0 0 ZT16-19 18.0329 18.0329 18.0329 ZT20-23 20.5729 20.5729 20.5729