condition mean min max ZT0-3 15.285599999999999 15.285599999999999 15.285599999999999 ZT4-7 9.62523 9.62523 9.62523 ZT8-11 11.034600000000001 11.034600000000001 11.034600000000001 ZT12-15 13.6618 13.6618 13.6618 ZT16-19 20.774250000000002 20.774250000000002 20.774250000000002 ZT20-23 17.6067 17.6067 17.6067