condition mean min max ZT0-3 861.8499999999999 861.8499999999999 861.8499999999999 ZT4-7 888.8 888.8 888.8 ZT8-11 865.0999999999999 865.0999999999999 865.0999999999999 ZT12-15 834.75 834.75 834.75 ZT16-19 892.75 892.75 892.75 ZT20-23 810.3 810.3 810.3