condition mean min max ZT0-3 12.202851 12.202851 12.202851 ZT4-7 10.086936999999999 10.086936999999999 10.086936999999999 ZT8-11 9.90096 9.90096 9.90096 ZT12-15 9.115558499999999 9.115558499999999 9.115558499999999 ZT16-19 10.873738 10.873738 10.873738 ZT20-23 10.722138000000001 10.722138000000001 10.722138000000001