condition mean min max ZT0-3 23.743 17.2006 30.869999999999997 ZT4-7 13.8401 13.8401 13.8401 ZT8-11 29.25105 29.25105 29.25105 ZT12-15 46.580975 46.22525 46.9367 ZT16-19 37.9776 37.9776 37.9776 ZT20-23 42.00685 42.00685 42.00685