condition mean min max ZT0-3 755.232057 755.232057 755.232057 ZT4-7 671.8588235 671.8588235 671.8588235 ZT8-11 573.924569 573.924569 573.924569 ZT12-15 579.2303515 579.2303515 579.2303515 ZT16-19 579.17273 579.17273 579.17273 ZT20-23 499.804935 499.804935 499.804935