condition mean min max ZT0-3 17.56005 17.56005 17.56005 ZT4-7 4.230365 4.230365 4.230365 ZT8-11 5.14979 5.14979 5.14979 ZT12-15 22.94385 22.94385 22.94385 ZT16-19 42.26765 42.26765 42.26765 ZT20-23 33.29805 33.29805 33.29805