condition mean min max ZT0-3 1955.55 1955.55 1955.55 ZT4-7 1782.5 1782.5 1782.5 ZT8-11 1648.0 1648.0 1648.0 ZT12-15 1545.1 1545.1 1545.1 ZT16-19 1908.85 1908.85 1908.85 ZT20-23 1992.5 1992.5 1992.5