condition mean min max ZT0-3 18.59265 15.76075 20.0163 ZT4-7 14.97925 14.97925 14.97925 ZT8-11 9.761355 9.761355 9.761355 ZT12-15 10.747779999999999 9.02681 12.46875 ZT16-19 13.54115 13.54115 13.54115 ZT20-23 18.439799999999998 18.439799999999998 18.439799999999998