condition mean min max ZT0-3 592.635527 592.635527 592.635527 ZT4-7 840.9820364999999 840.9820364999999 840.9820364999999 ZT8-11 669.878502 669.878502 669.878502 ZT12-15 745.9423495000001 745.9423495000001 745.9423495000001 ZT16-19 460.75825000000003 460.75825000000003 460.75825000000003 ZT20-23 287.119638 287.119638 287.119638