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Table 4 Urinary urea-creatinine-ratio in the lower protein group versus high protein group in week two to seven after birth, showing significant difference in week 3 and from week 5 to week 7

From: Effect of increased enteral protein intake on plasma and urinary urea concentrations in preterm infants born at < 32 weeks gestation and < 1500 g birth weight enrolled in a randomized controlled trial – a secondary analysis

Weeks

Lower-protein group

urinary urea-creatinine-ratio

Higher-protein group

urinary urea-creatinine-ratio

p-value

2

38,0 (24,1–52,7)

43,3 (30,2–49,5)

0.77

3

25,8 (16,9–41,1)

39,9 (33,5–51,0)

0.0019

4

26,2 (20,7–31,3)

30,9 (24,4–46,5)

0.086

5

21,0 (14,9–26,0)

30,7 (26,2–38,5)

0.0024

6

25,3 (17,4–29,6)

33,7 (25,1–42,2)

0.029

7

16,3 (12,1–30,8)

34,0 (27,8–52,0)

0.0083