condition mean min max ZT0-3 15.263950000000001 15.263950000000001 15.263950000000001 ZT4-7 6.340475 6.340475 6.340475 ZT8-11 11.05245 11.05245 11.05245 ZT12-15 54.717 54.717 54.717 ZT16-19 38.49635 38.49635 38.49635 ZT20-23 26.0914 26.0914 26.0914