condition mean min max ZT0-3 184.932472 184.932472 184.932472 ZT4-7 217.12967250000003 217.12967250000003 217.12967250000003 ZT8-11 196.296526 196.296526 196.296526 ZT12-15 224.38287300000002 224.38287300000002 224.38287300000002 ZT16-19 222.8348765 222.8348765 222.8348765 ZT20-23 202.51263649999999 202.51263649999999 202.51263649999999