condition mean min max ZT0-3 11.869333 11.869333 11.869333 ZT4-7 12.410910999999999 12.410910999999999 12.410910999999999 ZT8-11 11.608156 11.608156 11.608156 ZT12-15 10.846899 10.846899 10.846899 ZT16-19 12.244135499999999 12.244135499999999 12.244135499999999 ZT20-23 10.68803 10.68803 10.68803