condition mean min max ZT0-3 10.259097 10.259097 10.259097 ZT4-7 12.1661715 12.1661715 12.1661715 ZT8-11 12.206225 12.206225 12.206225 ZT12-15 11.780833 11.780833 11.780833 ZT16-19 11.5593445 11.5593445 11.5593445 ZT20-23 9.709681 9.709681 9.709681