condition mean min max ZT0-3 14.15540655225 7.035729631000001 21.2750834735 ZT4-7 29.56250697 27.724839255 31.400174685 ZT8-11 29.74976416 29.380229485 30.119298835000002 ZT12-15 18.6641370925 15.134196755 22.19407743 ZT16-19 14.824657379999998 13.886649214999998 15.762665544999999 ZT20-23 15.8709918825 15.756478775000001 15.985504989999999