condition mean min max ZT0-3 312.349914 312.349914 312.349914 ZT4-7 227.72019799999998 227.72019799999998 227.72019799999998 ZT8-11 249.73884299999997 249.73884299999997 249.73884299999997 ZT12-15 360.102297 360.102297 360.102297 ZT16-19 344.849344 344.849344 344.849344 ZT20-23 342.39837450000005 342.39837450000005 342.39837450000005