Albuminuria: population epidemiology and concordance in Australian children aged 11-12 years and their parents

Nicholas G Larkins; Siah Kim; John B Carlin; Anneke C Grobler; David P Burgner; Katherine Lange; Jonathan C Craig; Melissa Wake

doi:10.1136/bmjopen-2017-020262

Albuminuria: population epidemiology and concordance in Australian children aged 11-12 years and their parents

BMJ Open. 2019 Jul 4;9(Suppl 3):75-84. doi: 10.1136/bmjopen-2017-020262.

Authors

Nicholas G Larkins^{1

2

3}, Siah Kim^{1

4}, John B Carlin^{5

6}, Anneke C Grobler^{5

7}, David P Burgner^{5

7

8}, Katherine Lange^{5

7}, Jonathan C Craig^{1

2}, Melissa Wake^{5

7

9}

Affiliations

¹ Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.
² School of Public Health, University of Sydney, Sydney, New South Wales, Australia.
³ Department of Nephrology, Perth Children's Hospital, Nedlands, Western Australia, Australia.
⁴ School of Women's and Children's Health, University of New South Wales, Sydney, New South Wales, Australia.
⁵ Murdoch Children's Research Institute, Parkville, Victoria, Australia.
⁶ Melbourne School of Population and Global Health, University of Melbourne, Parkville, Victoria, Australia.
⁷ Department of Paediatrics, University of Melbourne, Parkville, Victoria, Australia.
⁸ Department of Paediatrics, Monash University, Melbourne, Victoria, Australia.
⁹ Department of Paediatrics and The Liggins Institute, The University of Auckland, Auckland, New Zealand.

Abstract

Objectives: To describe the distribution of albuminuria among Australian children aged 11-12 years and their parents, and assess its intergenerational concordance within parent-child dyads.

Design: Population-based cross-sectional study (the Child Health CheckPoint), nested within the Longitudinal Study of Australian Children.

Setting: Assessment centres (seven Australian cities and eight regional towns) and home visits across Australia, February 2015 to March 2016.

Participants: Of all participating CheckPoint families (n=1874), 1557 children (46.2% girls) and 1454 parents (85.5% mothers) provided random urine samples at the visit; samples from menstruating females were excluded.

Outcome measures: Urine albumin-to-creatinine ratio (ACR) and its components (urine albumin and creatinine concentration); albuminuria was defined as an ACR ≥3.4 mg/mmol. Pearson's correlation coefficients and multivariable linear regression models assessed parent-child concordance, using log-transformed data due to skewing. Survey weights and methods were applied to account for the complex sample design.

Results: The median ACR for children was 1.03 mg/mmol (IQR 0.65-1.97) and 1.01 mg/mmol (IQR 0.60-2.09) for adults. The median ACR was higher in girls (1.20, IQR 0.71-2.65) than boys (0.90, IQR 0.61-1.65) and in mothers (1.13, IQR 0.63-2.33) than fathers (0.66, IQR 0.41-1.05). Albuminuria was detected in 15.1% of children (girls 20.8%, boys 10.1%) and 13.5% of adults (15.1% mothers, 4.0% fathers) had albuminuria. There was a small correlation between parent and child ACR (Pearson correlation coefficient 0.06, 95% CI 0.01 to 0.12).

Conclusions: Albuminuria is common among Australian children and adults, which is of concern because it predicts risk for kidney and cardiovascular disease, and mortality. The weak concordance among intergenerational pairs for urine ACR suggests either that genetic heritability is low or that it becomes evident only at later offspring life stages.

Keywords: albuminuria; children; epidemiological studies; inheritance patterns; kidney; reference values.

Publication types

Multicenter Study
Research Support, Non-U.S. Gov't

MeSH terms

Adult
Albuminuria / epidemiology*
Albuminuria / urine
Australia / epidemiology
Cardiovascular Diseases / urine
Child
Creatinine / urine*
Cross-Sectional Studies
Female
Humans
Kidney Diseases / urine
Linear Models
Longitudinal Studies
Male
Middle Aged
Multivariate Analysis
Parents*
Urinalysis

Substances

Creatinine