condition mean min max ZT0-3 1.7482553675 1.548415813 1.948094922 ZT4-7 5.25687941225 3.4882811890000003 7.0254776355 ZT8-11 8.54657986475 7.3353958565 9.757763873 ZT12-15 10.826531111 8.656955331999999 12.99610689 ZT16-19 5.0821115930000005 4.6401467395000005 5.5240764465000005 ZT20-23 5.333084443 5.114472026 5.55169686