condition mean min max ZT0-3 234.5 234.5 234.5 ZT4-7 270.0 270.0 270.0 ZT8-11 330.5 330.5 330.5 ZT12-15 377.25 377.25 377.25 ZT16-19 249.39999999999998 249.39999999999998 249.39999999999998 ZT20-23 164.35 164.35 164.35