condition mean min max ZT0-3 19.504350000000002 19.504350000000002 19.504350000000002 ZT4-7 17.97325 17.97325 17.97325 ZT8-11 17.2732 17.2732 17.2732 ZT12-15 13.9922 13.9922 13.9922 ZT16-19 18.157600000000002 18.157600000000002 18.157600000000002 ZT20-23 16.4924 16.4924 16.4924