condition mean min max ZT0-3 475.691881 475.691881 475.691881 ZT4-7 396.948178 396.948178 396.948178 ZT8-11 513.6433675 513.6433675 513.6433675 ZT12-15 491.20215199999996 491.20215199999996 491.20215199999996 ZT16-19 733.7077625000001 733.7077625000001 733.7077625000001 ZT20-23 570.973921 570.973921 570.973921