condition mean min max ZT0-3 29.604179932500003 26.588254685000003 32.62010518 ZT4-7 7.664304594999999 5.5346076884999995 9.794001501499999 ZT8-11 5.1740239384999995 3.5449464530000006 6.803101423999999 ZT12-15 6.849617693 5.854889878 7.844345508 ZT16-19 9.3839870115 8.095707786 10.672266237 ZT20-23 15.4274230525 14.447872185000001 16.40697392