condition mean min max ZT0-3 1780.25 1780.25 1780.25 ZT4-7 1832.9 1832.9 1832.9 ZT8-11 2161.1 2161.1 2161.1 ZT12-15 2015.4499999999998 2015.4499999999998 2015.4499999999998 ZT16-19 1923.9 1923.9 1923.9 ZT20-23 1976.8000000000002 1976.8000000000002 1976.8000000000002