condition mean min max ZT0-3 2.038925 2.038925 2.038925 ZT4-7 1.482695 1.482695 1.482695 ZT8-11 2.430285 2.430285 2.430285 ZT12-15 2.598155 2.598155 2.598155 ZT16-19 5.26954 5.26954 5.26954 ZT20-23 2.567705 2.567705 2.567705