condition mean min max ZT0-3 16.25565 15.72945 16.78185 ZT4-7 11.598749999999999 11.598749999999999 11.598749999999999 ZT8-11 20.067300000000003 20.067300000000003 20.067300000000003 ZT12-15 0 0 0 ZT16-19 19.1618 19.1618 19.1618 ZT20-23 15.8917 15.8917 15.8917