condition mean min max ZT0-3 13.37815 13.37815 13.37815 ZT4-7 24.4847 24.4847 24.4847 ZT8-11 16.030549999999998 16.030549999999998 16.030549999999998 ZT12-15 18.933149999999998 18.933149999999998 18.933149999999998 ZT16-19 10.15116 10.15116 10.15116 ZT20-23 15.875399999999999 15.875399999999999 15.875399999999999