condition mean min max ZT0-3 1490.701861 1490.701861 1490.701861 ZT4-7 726.2429975 726.2429975 726.2429975 ZT8-11 930.3433689999999 930.3433689999999 930.3433689999999 ZT12-15 938.979839 938.979839 938.979839 ZT16-19 1974.393385 1974.393385 1974.393385 ZT20-23 1907.9916119999998 1907.9916119999998 1907.9916119999998