condition mean min max ZT0-3 2687.610703 2687.610703 2687.610703 ZT4-7 1946.3586285000001 1946.3586285000001 1946.3586285000001 ZT8-11 1733.382941 1733.382941 1733.382941 ZT12-15 1982.372509 1982.372509 1982.372509 ZT16-19 1736.042082 1736.042082 1736.042082 ZT20-23 1900.1614359999999 1900.1614359999999 1900.1614359999999