condition mean min max ZT0-3 9.92408 9.92408 9.92408 ZT4-7 9.955303 9.955303 9.955303 ZT8-11 12.08988 12.08988 12.08988 ZT12-15 10.368027 10.368027 10.368027 ZT16-19 10.2736545 10.2736545 10.2736545 ZT20-23 12.641276999999999 12.641276999999999 12.641276999999999