condition mean min max ZT0-3 506.140142 506.140142 506.140142 ZT4-7 370.6552195 370.6552195 370.6552195 ZT8-11 416.986965 416.986965 416.986965 ZT12-15 499.1542465 499.1542465 499.1542465 ZT16-19 616.2406315000001 616.2406315000001 616.2406315000001 ZT20-23 601.0111875 601.0111875 601.0111875