condition mean min max ZT0-3 2007.0500000000002 2007.0500000000002 2007.0500000000002 ZT4-7 2556.7 2556.7 2556.7 ZT8-11 2284.5 2284.5 2284.5 ZT12-15 1998.9 1998.9 1998.9 ZT16-19 2090.55 2090.55 2090.55 ZT20-23 2098.65 2098.65 2098.65