condition mean min max ZT0-3 15.424600000000002 15.424600000000002 15.424600000000002 ZT4-7 12.2909 12.2909 12.2909 ZT8-11 9.25855 9.25855 9.25855 ZT12-15 8.25347 8.25347 8.25347 ZT16-19 17.68845 17.68845 17.68845 ZT20-23 16.1621 16.1621 16.1621