condition mean min max ZT0-3 166.71476 166.71476 166.71476 ZT4-7 233.59625849999998 233.59625849999998 233.59625849999998 ZT8-11 291.5525625 291.5525625 291.5525625 ZT12-15 203.86053600000002 203.86053600000002 203.86053600000002 ZT16-19 248.34912400000002 248.34912400000002 248.34912400000002 ZT20-23 249.04929850000002 249.04929850000002 249.04929850000002