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Table 2 Patients evaluated for and diagnosed with rickets grouped according to peak alkaline phosphatase activity (P-APA).

From: High frequencies of elevated alkaline phosphatase activity and rickets exist in extremely low birth weight infants despite current nutritional support

P-APA (IU/L)

Number of Patients

Number Evaluated for Rickets

Number Diagnosed with Rickets

<600

42

2

1

600–800

29

6

3

800–1000

23

10

4

>1000

19

14

10