condition mean min max ZT0-3 10.45486042625 8.237417283 12.6723035695 ZT4-7 15.11670791 12.29186081 17.941555010000002 ZT8-11 19.65692149 18.541037165 20.772805814999998 ZT12-15 9.829642855 8.2832483285 11.376037381500002 ZT16-19 7.596900936 7.3316122595 7.8621896125 ZT20-23 7.28972482175 6.708209617 7.871240026500001