condition mean min max ZT0-3 16.391598333333334 7.3287949999999995 21.9849 ZT4-7 7.91575 7.91575 7.91575 ZT8-11 11.71565 11.71565 11.71565 ZT12-15 17.50125 15.9902 19.0123 ZT16-19 22.1676 22.1676 22.1676 ZT20-23 25.87055 25.87055 25.87055