condition mean min max ZT0-3 22.225250000000003 22.225250000000003 22.225250000000003 ZT4-7 18.84855 18.84855 18.84855 ZT8-11 15.04725 15.04725 15.04725 ZT12-15 14.24905 14.24905 14.24905 ZT16-19 15.5564 15.5564 15.5564 ZT20-23 19.58065 19.58065 19.58065