condition mean min max ZT0-3 810.557732 810.557732 810.557732 ZT4-7 351.5336925 351.5336925 351.5336925 ZT8-11 209.39042849999998 209.39042849999998 209.39042849999998 ZT12-15 215.4598585 215.4598585 215.4598585 ZT16-19 406.7280135 406.7280135 406.7280135 ZT20-23 533.5047335 533.5047335 533.5047335