condition mean min max ZT0-3 78.824283 78.824283 78.824283 ZT4-7 74.2907015 74.2907015 74.2907015 ZT8-11 83.0922475 83.0922475 83.0922475 ZT12-15 51.608216999999996 51.608216999999996 51.608216999999996 ZT16-19 27.107585999999998 27.107585999999998 27.107585999999998 ZT20-23 31.026897 31.026897 31.026897