condition mean min max ZT0-3 4.32245713525 3.8039598435 4.840954427 ZT4-7 2.9904275255 2.3903099584999996 3.5905450925 ZT8-11 4.010757685250001 3.3827870410000003 4.6387283295 ZT12-15 4.386881323 3.8471835665 4.9265790795 ZT16-19 3.73589483325 3.6458614120000004 3.8259282545 ZT20-23 5.763319911 5.585969072499999 5.9406707495