condition mean min max ZT0-3 7.174012196750001 4.442152899 9.905871494500001 ZT4-7 15.4566936575 13.138740175 17.77464714 ZT8-11 14.40124792325 12.2989237615 16.503572085000002 ZT12-15 7.776965693999999 7.423385766999999 8.130545621 ZT16-19 9.52637638875 9.1513515045 9.901401273000001 ZT20-23 7.075320463000001 6.400726638 7.749914288