condition mean min max ZT0-3 322.94442 322.94442 322.94442 ZT4-7 320.58463700000004 320.58463700000004 320.58463700000004 ZT8-11 262.1521765 262.1521765 262.1521765 ZT12-15 313.54267949999996 313.54267949999996 313.54267949999996 ZT16-19 381.1902865 381.1902865 381.1902865 ZT20-23 336.69976099999997 336.69976099999997 336.69976099999997