condition mean min max ZT0-3 13.048397158499998 12.709929777 13.38686454 ZT4-7 10.32872742775 8.4596499705 12.197804885 ZT8-11 14.9517787425 13.024363815000001 16.87919367 ZT12-15 17.1544827375 15.969187915000001 18.33977756 ZT16-19 19.999906445 19.797509995 20.202302895000003 ZT20-23 20.1331235575 19.66779741 20.598449705