condition mean min max ZT0-3 5.4518699999999995 5.4518699999999995 5.4518699999999995 ZT4-7 5.298125000000001 5.298125000000001 5.298125000000001 ZT8-11 5.34136 5.34136 5.34136 ZT12-15 6.024039999999999 6.024039999999999 6.024039999999999 ZT16-19 9.61006 9.61006 9.61006 ZT20-23 7.981345 7.981345 7.981345