condition mean min max ZT0-3 3.6191341657500002 3.2423957725 3.995872559 ZT4-7 3.4613359839999998 3.277632975 3.645038993 ZT8-11 4.37990888875 3.252389391 5.5074283865 ZT12-15 6.66908186975 5.9102885015 7.427875238 ZT16-19 6.1375966564999995 5.988476992 6.286716321 ZT20-23 6.18409710625 6.049823642 6.3183705705