condition mean min max ZT0-3 8.747198 8.747198 8.747198 ZT4-7 9.916465500000001 9.916465500000001 9.916465500000001 ZT8-11 10.2047065 10.2047065 10.2047065 ZT12-15 9.007985000000001 9.007985000000001 9.007985000000001 ZT16-19 9.8800975 9.8800975 9.8800975 ZT20-23 9.606742 9.606742 9.606742