condition mean min max ZT0-3 2089.85 2089.85 2089.85 ZT4-7 2291.6 2291.6 2291.6 ZT8-11 2225.35 2225.35 2225.35 ZT12-15 1996.4 1996.4 1996.4 ZT16-19 1986.85 1986.85 1986.85 ZT20-23 1918.3500000000001 1918.3500000000001 1918.3500000000001