condition mean min max ZT0-3 2.08843664775 1.1646156245000001 3.0122576710000004 ZT4-7 2.7438744445000003 2.0305995550000002 3.4571493340000004 ZT8-11 5.61145789 4.9347213215 6.2881944585 ZT12-15 10.213283516 7.014543327 13.412023705 ZT16-19 9.936774221499999 9.5583255965 10.3152228465 ZT20-23 11.646703392500001 10.737566005000001 12.55584078