condition mean min max ZT0-3 12.680522 12.680522 12.680522 ZT4-7 12.160597500000002 12.160597500000002 12.160597500000002 ZT8-11 12.713427 12.713427 12.713427 ZT12-15 11.952787 11.952787 11.952787 ZT16-19 13.46504 13.46504 13.46504 ZT20-23 13.3278035 13.3278035 13.3278035