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.
The US standards are based primarily on the 1968 Recommended Dietary Allowances (RDAs), whereas the Canadian standards are based on the 1983 Recommended Nutrient Intakes. As the committee noted, it is appropriate to use the new Dietary Reference Intakes (DRIs) as the basis for these reference values.