condition mean min max ZT0-3 453.497199 453.497199 453.497199 ZT4-7 414.1333185 414.1333185 414.1333185 ZT8-11 344.829146 344.829146 344.829146 ZT12-15 435.658908 435.658908 435.658908 ZT16-19 450.99787649999996 450.99787649999996 450.99787649999996 ZT20-23 447.7705185 447.7705185 447.7705185