Table 1.

Koo et al. Criteria for osteopenia of prematurity

Grades	Description
Grade 0:	Normal density of bone cortex along shaft with normal dense white line at metaphysis and normal band of lucency, and thinning of cortex.
Grade 1:	Loss of dense white line at the metaphysis, increased sub-metaphyseal lucency and thinning of cortex.
Grade 2:	Changes in grade 1 plus irregularity and fraying of metaphysis, with splaying and cupping that is indicative of rickets.
Grade 3:	Indications of rickets with evidence of fractures.