condition mean min max ZT0-3 11.2008069725 10.12263813 12.278975814999999 ZT4-7 5.61881845725 5.389917705999999 5.8477192085 ZT8-11 3.7973435665 3.552946349 4.041740784 ZT12-15 5.520960732000001 3.8918951994999995 7.150026264500001 ZT16-19 8.026541693750001 6.893792056500001 9.159291331 ZT20-23 15.540004902500002 13.98056698 17.099442825