condition mean min max ZT0-3 55.721327 55.721327 55.721327 ZT4-7 31.7154065 31.7154065 31.7154065 ZT8-11 29.0269735 29.0269735 29.0269735 ZT12-15 25.434416499999998 25.434416499999998 25.434416499999998 ZT16-19 15.2079205 15.2079205 15.2079205 ZT20-23 17.8803125 17.8803125 17.8803125