The extent of a focal tendon abnormality was intrasubstance in none (0%) of 16 patients with full-thickness tears, one (20%) of five patients with bursal surface partial-thickness tears, two (20%) of 10 patients with articular surface partial-thickness tears, and two (15%) of 13 patients with tendons without tear.
1 Adequate Intake (AI), where no RDA has been established, but the amount established is somewhat less firmly believed to be adequate for everyone in the demographic group.  Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A) that can be harmful in large amounts.
About RDA. RDA stands for Recommended Dietary Allowance, also commonly known as Recommended Daily Allowances. It is the recommended daily vitamins and mineral intake considered adequate for healthy people. The RDA was last revised in 1989, and is rather outdated. Parts of it are replaced by the Dietary Reference Intakes (DRI), the most recent dietary guidelines by the Food and Nutrition Board of the Institute of Medicine, National Academy of Sciences, 1997-2001, in a collaboration between the US and Canada.