condition mean min max ZT0-3 5.53639852575 5.2572341005 5.815562951 ZT4-7 6.60923862875 5.992258968 7.2262182895 ZT8-11 7.028140548250001 6.7573393915 7.298941705 ZT12-15 5.59634739 5.2853453015 5.9073494785000005 ZT16-19 4.32161922125 4.3116948845 4.331543558 ZT20-23 4.49085285 4.2869658095 4.6947398905