condition mean min max ZT0-3 1903.25 1903.25 1903.25 ZT4-7 1996.1 1996.1 1996.1 ZT8-11 2608.1 2608.1 2608.1 ZT12-15 2383.8 2383.8 2383.8 ZT16-19 2142.5 2142.5 2142.5 ZT20-23 1998.05 1998.05 1998.05