condition mean min max ZT0-3 29.68710898 22.290245130000002 37.08397283 ZT4-7 16.009828185 14.333395939999999 17.68626043 ZT8-11 15.259560279999999 13.453887045 17.065233515 ZT12-15 11.308170445000002 10.6688569925 11.947483897500002 ZT16-19 15.460898997500001 14.159081775 16.76271622 ZT20-23 32.4127873875 27.875964755 36.94961002