Correlation of the Dietary Protein Intake between Those Estimated from a Short Protein Food-Recall Questionnaire and from 24-Hour Urinary Urea-Nitrogen Excretion in Stages 3-4 Chronic Kidney Disease Patients
Table 3
Estimated daily protein intake (DPI) by various clinical factors.
Factors
Number of study participants
Estimated DPI
Mean difference
value (comparison mean difference between categories in each group of clinical factors)
S-PFRQ
PNA
Causes of CKD
Non-DKD
29
30.83 ± 17.68
42.59 ± 19.96
−11.76
0.172
DKD
31
26.22 ± 9.52
38.82 ± 10.35
−12.60
Stages of CKD
3A
21
21.22 ± 10.26
39.58 ± 13.62
−18.35
0.0001 [3A vs 3B]
3B
28
33.43 ± 12.14
40.62 ± 18.70
−7.18
0.029 [3B vs 4]
4
11
25.14 ± 13.51
41.49 ± 18.10
−16.83
0.919 [3A vs 4]
Proteinuria status
No proteinuria
25
26.70 ± 10.13
36.86 ± 15.18
−10.19
0.094
Positive proteinuria
35
30.70 ± 17.98
44.29 ± 15.73
−13.84
CKD = chronic kidney disease, DPI = daily protein intake, PNA = protein-equivalent of total nitrogen appearance, S-PFRQ = short-protein food recall questionnaire. Mean difference = DPI estimation from S-PFRQ minus DPI estimation from PNA.
