condition mean min max ZT0-3 24.5841 24.5841 24.5841 ZT4-7 34.083 34.083 34.083 ZT8-11 25.8535 25.8535 25.8535 ZT12-15 22.9269 22.9269 22.9269 ZT16-19 15.295449999999999 15.295449999999999 15.295449999999999 ZT20-23 19.090600000000002 19.090600000000002 19.090600000000002