condition mean min max ZT0-3 2051.9 2051.9 2051.9 ZT4-7 1958.0 1958.0 1958.0 ZT8-11 1909.5 1909.5 1909.5 ZT12-15 1934.4499999999998 1934.4499999999998 1934.4499999999998 ZT16-19 2006.8 2006.8 2006.8 ZT20-23 2171.15 2171.15 2171.15