condition mean min max ZT0-3 11.649999999999999 11.649999999999999 11.649999999999999 ZT4-7 10.027635 10.027635 10.027635 ZT8-11 9.865105 9.865105 9.865105 ZT12-15 9.915189999999999 9.915189999999999 9.915189999999999 ZT16-19 11.89225 11.89225 11.89225 ZT20-23 11.1074 11.1074 11.1074