condition mean min max ZT0-3 54.1296825 54.1296825 54.1296825 ZT4-7 59.88935 59.88935 59.88935 ZT8-11 121.84094999999999 121.84094999999999 121.84094999999999 ZT12-15 322.31600000000003 322.31600000000003 322.31600000000003 ZT16-19 357.1295 357.1295 357.1295 ZT20-23 297.96340833333335 297.96340833333335 297.96340833333335