condition mean min max ZT0-3 14.262599999999999 14.262599999999999 14.262599999999999 ZT4-7 12.575700000000001 12.575700000000001 12.575700000000001 ZT8-11 10.603745 10.603745 10.603745 ZT12-15 8.375415 8.375415 8.375415 ZT16-19 13.3668 13.3668 13.3668 ZT20-23 15.23215 15.23215 15.23215