condition mean min max ZT0-3 13.12075 13.12075 13.12075 ZT4-7 8.455095 8.455095 8.455095 ZT8-11 4.447274999999999 4.447274999999999 4.447274999999999 ZT12-15 5.37819 5.37819 5.37819 ZT16-19 10.484200000000001 10.484200000000001 10.484200000000001 ZT20-23 11.56155 11.56155 11.56155