condition mean min max ZT0-3 12.5859 12.5859 12.5859 ZT4-7 12.7038475 12.7038475 12.7038475 ZT8-11 13.2247475 13.2247475 13.2247475 ZT12-15 11.762183499999999 11.762183499999999 11.762183499999999 ZT16-19 17.1927115 17.1927115 17.1927115 ZT20-23 18.803724 18.803724 18.803724