Urinary albumin excretion in healthy adults: a cross sectional study of 24-hour versus timed overnight samples and impact of GFR and other personal characteristics

Table 2 Excretion rates and concentrations of albumin in 24 h and overnight (ON) samples

	N	Mean	Range	P-value difference 24 h/overnight
Albumin excretion
24 h AER (mg/24 h)	130	7.46	0.88-35.7	<0.001
ON AER (mg/24 h)	145	5.85	0.81-29.6	<0.001
Albumin concentration
24 h UAC (mg/L)	130	4.30	1.70-22.0	<0.001
ON UAC (mg/L)	145	6.33	1.70-45.0	<0.001
24 h ACR (mg/g Cr)	130	5.85	1.36-24.3	<0.001
ON ACR (mg/g Cr)	145	4.94	0.83-24.9	<0.001
24 h ASG (mg/L)	130	4.26	0.67-20.0	0.93
ON ASG (mg/L)	145	4.46	0.98-27.3	0.93
Creatinine concentration
24 h UCC (g/L)	130	0.77	0.18-3.94	<0.001
ON UCC (g/L)	145	1.28	0.33-2.49	<0.001
Specific gravity
24 h SG	130	1.016	0.005-1.038	<0.001
ON SG	145	1.021	1.006-1.040	<0.001
Urinary flow rate
24 h UF (mL/h)	130	81.2	20.4-246	<0.001
ON UF (mL/h)	145	49.2	11.5-150	<0.001
Creatinine excretion rate
24 h CER (mg/24 h)	130	11.6	4.69-21.8	<0.001
Overnight CER (mg/24 h)	145	11.0	3.07-19.6

Note: Differences between 24 h and ON samples were calculated for 123 paired samples. Abbreviations:AER Albumin excretion rate, UAC Urinary albumin concentration, ACR Albumin to creatinine ratio, Cr Creatinine, ASG Albumin adjusted for specific gravity, UCC Urinary creatinine concentration, SG Specific gravity, UF Urinary flow.

ISSN: 1471-2369