condition mean min max ZT0-3 7.9524799999999995 6.80847 9.09649 ZT4-7 11.105654999999999 11.105654999999999 11.105654999999999 ZT8-11 7.77888 7.77888 7.77888 ZT12-15 0 0 0 ZT16-19 7.095699999999999 7.095699999999999 7.095699999999999 ZT20-23 9.14855 9.14855 9.14855