Int J Med Sci 2020; 17(11):1515-1521. doi:10.7150/ijms.46477 This issue Cite

Research Paper

Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study

Chao Chen1*, Guangxu Liu2*, Xiaolan Yu3, Yongbo Yu4 Corresponding address, Guangfeng Liu5 Corresponding address

1. Xuanwu Hospital, Capital Medical University, Beijing 100053, China.
2. National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China.
3. Beijing Jiangong Hospital, Beijing, 100054, China.
4. Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
5. Department of Emergency, Feicheng Traditional Chinese Medicine Hospital, Taian, Shandong, 271600, China.
*These authors contributed equally to this work.

Citation:
Chen C, Liu G, Yu X, Yu Y, Liu G. Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study. Int J Med Sci 2020; 17(11):1515-1521. doi:10.7150/ijms.46477. https://www.medsci.org/v17p1515.htm
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Abstract

Objective: Our study aimed to evaluate the association between prediabetes and renal dysfunction, and further assess which of glycemic indices of fasting plasma glucose (FPG), postprandial plasma glucose (PPG) and hemoglobin A1c (HbA1c) has a higher risk of renal dysfunction.

Methods: This was a community-based prospective cohort study, which included 7015 participants from Beijing and Taian between May and October in 2015. The outcome was the renal dysfunction defined as estimated glomerular filtration rate (eGFR)<60 mL/min/1.73 m2. Univariate and multivariate logistic regression model was performed, and calculated the odds ratio (OR) and 95% confidence interval (95%CI) of renal dysfunction. Receiver operating curve (ROC) analysis was used to predict renal dysfunction for glycemic indices.

Results: 121 renal dysfunction cases were identified. We found that the adjusted ORs (95%CI) of renal dysfunction were 1.72 (1.11-2.38), 1.48 (1.09-1.93), 1.97 (1.27-2.89) and 1.35 (1.07-2.13), respectively, for those with prediabetes, impaired fasting glucose (IFG), impaired glucose tolerance (IGT) and elevated HbA1c, compared with individuals with normal glucose tolerance. And IGT presented a higher risk of renal dysfunction than other glycemic indices. The similar results were obtained by performing the subgroup analysis. ROC analysis revealed the PPG had a higher predictive value for renal dysfunction.

Conclusion: We found prediabetes was positively associated with the risk of renal dysfunction and PPG had a higher risk and predictive value of renal dysfunction than other glycemic indices of FPG and HbA1c.

Keywords: prediabetes, renal dysfunction, association

Introduction

Prediabetes is considered as a condition that plasma glucose is abnormally elevated, but not up to the standard of diabetes [1]. In the year of 2013, the estimated overall prevalence of prediabetes was 35.7% of Chinese adults [2]. Individuals with prediabetes are at high risk of developing diabetes and complications such as kidney, eye and cardiovascular disease. Previous studies have demonstrated that diabetes could increase the risk of kidney dysfunction [3, 4], which was defined as the estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m2 [5]. However, whether prediabetes contributes to the impairment of kidney function is not well characterized [6-10]. The data based on the cross-sectional study of Cooperative Health Research in the Augsburg Region (KORA) showed that prediabetes had harmful influence on kidney function [11]. On the contrary, the results from the Framingham Heart Study offspring cohort (1991-1995) found that the risk factors of cardiovascular disease, not prediabetes, may affect the development of kidney disease [10]. To the best of our knowledge, it was equivocal for the association between prediabetes and kidney function among the Chinese population without diabetes [12, 13].

The plasma glucose including fasting glucose (FPG), postprandial plasma glucose (PPG) and hemoglobin A1c (HbA1c) was used to define the prediabetes according to American Diabetes Association (ADA) prediabetes diagnostic criteria. Many studies have the association between elevated plasma glucose levels and increasing risk of renal dysfunction or kidney disease. In the Atherosclerosis Risk in Communities study, the results demonstrated that HbA1c were better performance of kidney disease than fasting glucose or 2-hour glucose in prediabetes population [14]. However, several studies from Asian reported that elevated HbA1c or PPG, not FPG, presented an increasing risk of kidney disease [15-17]. Moreover, one study from the Caucasian concluded that FPG was not associated with the development of kidney disease [18]. Thus, it is discrepant for the association between glycemic indices and renal function and it is not clear that which of glycemic indices presented a close association with increasing risk of renal dysfunction.

The objective of this study was to investigate the effects of prediabetes on renal dysfunction in Chinese population without diabetes. Based on the glucose indices, we also compared the effects performance of FPG, PPG and HbA1c of prediabetes in their relationship with renal dysfunction.

Materials and Methods

Study participants

The participants were derived from a community-based prospective cohort study in Shijingshan district of Beijing and Taian city of Shandong Province. The participants who were aged 40 years and older and identified by the local residence registration systems were included and there was no restriction on gender or ethnicity. From May to October of 2015, 8236 participants were invited by the trained community workers and conducted the follow-up by face-to-face interview during July and December, 2018. Among them, we excluded 1093 participants who had already kidney disease and diabetes at baseline and 101 participants who had missing key variables. We further excluded 27 participants with lost to follow-up, and thus there were 7015 participants in this analysis (Figure 1). All of those participants gave written informed consent in accordance with the Declaration of Helsinki. The investigation was approved by the Committee on Human Research of the Xuanwu Hospital, Capital Medical University.

Data Collection

At baseline, in order to collect information on demographics, history of disease and corresponding medication use, smoking status and drinking status, all participants were asked to complete a standard questionnaire by a face-to-face interview. Information on weight, height and blood pressure was obtained through physical examination conducted by trained personnel. Weight was measured to the nearest 0.5 kg by an electronic weight scale with participants wearing only light clothing and after emptying the bladder. Height was measured with the participants removing their shoes, overcoats, and empties their pockets, using a vertical height meter to the nearest 0.1 cm. Body mass index (BMI) was calculated as weight (kilograms) divided by height (meters) squared (kg/m2). Blood pressure was measured in triplicate after a 5-min rest, using a mercury sphygmomanometer, and the mean value of the three readings was recorded. All participants provided 10 mL of blood sample after an overnight fast (at least 10 h) for biochemical analyses, including HbA1c, total cholesterol (TC), triglycerides (TG), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C) and serum creatinine (Scr). The Scr assay was measured with an autoanalyzer (c16000 system, ARCHITECT ci16200 analyzer; Abbott Laboratories, Chicago, IL, USA), which was standardized to an isotope dilution mass spectrometry reference measurement procedure. Estimated glomerular filtration rate (eGFR), which expressed in mL/min per 1.73 m2, was calculated on the basis of Scr, using the Chronic Kidney Disease Epidemiology Collaboration (kidney disease-EPI) formula: Male: if Scr ≤ 0.9 mg/dL then eGFR= 141 × (Scr /0.9) - 0.411 × (0.993) age, if Scr > 0.9 mg/dL: eGFR= 141 × (Scr/ 0.9) - 1.209 × (0.993) age. Female: if Scr ≤ 0.7 mg/dL then eGFR= 144 × (Scr /0.7) - 0.329 × (0.993) age, if Scr > 0.7 mg/dL then eGFR= 144 × (Scr /0.7) - 1.209 × (0:993) age.

Definitions of key variates

Renal dysfunction was defined as eGFR < 60 mL/min per 1.73 m2. Prediabetes was defined as fasting plasma glucose (FPG) 5.6-6.9 mmol/L (100-125 mg/dl), or postprandial plasma glucose (PPG) 7.8-11.0 mmol/l (140-199 mg/dl) or HbA1c 5.7-6.5% (39-47mmol/mol) according to the ADA criteria[19]. Impaired fasting glucose (IFG) was defined as FPG ≥ 5.6 mmol/L and < 7.0 mmol/L. Impaired glucose tolerance (IGT) was defined as PPG ≥ 7.8 mmol/L and < 11.0 mmol/L. Elevated HbA1c (EHbA1c) was defined as HbA1c ≥5.7% and < 6.5%. Hypertension was defined as systolic blood pressure (SBP) ≥140mmHg and /or diastolic blood pressure (DBP) ≥90mmHg from the mean of three measurements taken at baseline or being previously diagnosed by clinicians.

Statistical Analysis

For continuous variables, data was expressed as means ± standard deviations (SD), and data was expressed as frequency and percentages for categorical variables. We used t test, Kruskal-Wallis test or chi-square test to compare the baseline characteristics between normal glucose tolerance (NGT) and prediabetes. Logistic regression models were used to estimate the association between prediabetes and incident of kidney disease, by three step forward multivariable-adjusted models: model 1 unadjusted; model 2 adjusted for age, sex, BMI; model 3 adjusted for age, sex, BMI, TC, TG, HDL-C, LDL-C, SBP, and DBP. For further analyses, we conducted subgroup analysis stratified by sex and hypertension status, which adjusted all potential confounding factors. We further used the receiver-operating characteristic (ROC) curve analysis to assess the prediction of glycemic indices for events of renal dysfunction and calculate the Youden index for the occurrence of renal dysfunction, according to the ADA and WHO criteria. All statistical analyses were performed with the Statistical Analysis System (SAS) version 9.4 (SAS Institute Inc., Cary, NC, USA). Forest plots were drawn using the Graphpad Prism 7 (Graphpad Software Company, CA, USA). All tests were two-sided, and a value of P < 0.05 was considered as significant.

Results

Characteristics of participants at baseline

Among 8326 participants at baseline, we excluded 1093 participants with diabetes, 101 participants with key variable missing and 27 participants loss to follow-up. Finally, a total of 7015 participants were included in this study (Figure 1). The mean age of the study population was 57.3±7.4 years, and 4704 (67.1%) were female. According to the ADA criteria, 4321 participants had prediabetes and 2694 participants had NGT. Compared to the participants of NGT, the prediabetes participants were older and had higher levels of BMI, SBP, TC, TG, LDL-C, and lower levels of DBP, HDL-C (Table 1).

 Figure 1 

Flowchart of the study population and the incident of renal dysfunction during follow-up time.

Int J Med Sci Image
 Table 1 

Baseline characteristics of study participants

CharacteristicsNGT (n=2694)Prediabetes (n=4321)P value
Age (years)56.0±7.158.2±7.5<0.001
Female, n (%)1744 (64.7)2960 (68.5)<0.001
Current smoking, n (%)523 (19.4)1288 (29.8)<0.001
Current drinking, n (%)816 (30.3)1577 (36.5)<0.001
Physical exercise, n (%)1018 (37.8)1400 (32.4)<0.001
BMI (kg/m2)24.9±3.225.9±3.4<0.001
HbA1c (%)5.4 (5.3-5.5)5.9 (5.8-6.1)<0.001
SBP (mmHg), n (%)128.5±16.7132.2±16.7<0.001
DBP (mmHg), n (%)76.2±14.075.4±10.60.020
Hypertension, n (%)633 (23.5)1286 (29.8)<0.001
TC (mmol/L)5.0±0.65.3±0.6<0.001
TG (mmol/L)1.2±0.41.5±0.3<0.001
HDL-C (mmol/L)1.4±0.21.3±0.30.034
LDL-C (mmol/L)3.0±0.43.3±0.5<0.001
eGFR (mL/min/1.73 m2),
Median (IQR)
96.1 (87.3-102.3)93.5 (86.4-101.6)0.001

Data were expressed as mean ± standard deviation or frequency (%), unless specified;

P value: from t test, Kruskal-Wallis test or chi-square test;

Abbreviations: NGT: Normal glucose tolerance; BMI: Body mass index; HbA1c: Glycosylated hemoglobin; SBP: Systolic blood pressure; DBP: Diastolic blood pressure; TC: Total cholesterol; TG: Triglycerides; HDL-C: Fasting serum high density lipoprotein cholesterol; LDL-C: Low density lipoprotein cholesterol; eGFR: Estimated glomerular filtration rate. IQR: Interquartile range.

Association prediabetes defined by ADA criteria with renal dysfunction

There were 121 (1.7%) cases of renal dysfunction incidents during follow-up period. The odds ratio (OR) (95%CI) of renal dysfunction in participants with prediabetes, was 1.91 (1.46-2.96), respectively, compare with the participants with NGT. And the ORs (95%CI) of renal dysfunction in the phenotypes categorized by glycemic indices were 1.67 (1.34-2.72) with impaired fasting glucose (IFG), 2.38 (1.72-3.86) with IGT and 1.56 (1.26-2.37) with EHbA1c than the NGT group. After adjustment for age, sex, BMI, TC, TG, HDL-C, LDL-C, SBP, and DBP, the prediabetes group still presented a significantly higher occurrence risk of renal dysfunction than NGT (OR=1.72, 95%CI: 1.11-2.38). Furthermore, the similar results were shown in group of IFG, IGT and EHbA1c, but the IGT group had a higher risk of renal dysfunction (OR=1.97, 95%CI: 1.27-2.89) than the group of IFG and EHbA1c, after adjusting for all confounding factors (Table 2).

Subgroup analysis of the association between prediabetes and renal dysfunction

To further confirm the association of renal dysfunction with prediabetes and its phenotypes, we conducted subgroup analysis by sex and hypertension. The results showed that prediabetes and its phenotypes had a higher risk of renal dysfunction than the NGT participants after simultaneous adjustment for all potential confounding factors. However, only the phenotype of IGT was significantly associated with the risk of renal dysfunction (OR=2.34, 95%CI: 1.46-3.89) among male participants. Whereas, all participants with prediabetes, IFG, IGT and EHbA1c presented a higher risk of renal dysfunction than NGT participants, whether hypertension or not (Figure 2).

Predictive value of glycemic indices for renal dysfunction

ROC curve analysis was used to compare which glycemic indices of FPG, PPG and HbA1c could predict the events of renal dysfunction. The data showed that the area under curve (AUC) of PPG (AUC=0.63, 95%CI: 0.61-0.65) was higher than FPG (AUC=0.58, 95%CI: 0.56-0.61) and HbA1c (AUC=0.60, 95%CI: 0.58-0.61).The optimal cut-off values of predicting the occurrence of renal dysfunction were FPG ≥5.57 mmol/L, PPG ≥7.29 mmol/L and HbA1c ≥5.65%, which were mostly similar to those the cut-off values based on ADA criteria but were higher than those cut-off points of glycemic indices of FPG and PPG based on WHO criteria. Moreover, PPG had a higher Youden index than other glycemic indices in predicting renal dysfunction incidents.

Discussion

In this study, we found the prediabetes was positively associated with the renal dysfunction in Chinese middle aged and elderly population. The phenotype of prediabetes defined by glycemic indices indicated that the participants with IFG, IGT and EHbA1c all increased the risk of renal dysfunction compared with NGT participants, and IGT exhibited a higher risk of renal dysfunction. Furthermore, PPG presented a superior predictive effect for renal dysfunction.

Evidences showed that prediabetes was positive associated with renal function. Two prospective cohort studies revealed that prediabetes increased 40% [20] and 80% [7] risk of kidney disease, respectively. A meta-analysis including nine published cross-sectional or cohort studies completed before 2015 also indicated that prediabetes significantly increased 11% occurrence of renal function or kidney disease (OR=1.11, 95%CI: 1.02-1.21) [21]. Recently, a prospective cohort study including 7728 Korean adults showed that prediabetes was an independent risk factor for renal dysfunction [17]. And our findings also confirmed the positive association between prediabetes and renal dysfunction. On the contrary, a cross-sectional study [22] and another cohort study [8] indicated that prediabetes was not a risk factor for renal dysfunction. The inconsistence of these results could be explained by the discrepancies of definition of prediabetes using only IFG or elevated HbA1c, not IGT. Therefore, some participants with impaired postprandial plasma glucose maybe misclassify to “NGT” individuals. In our study, the definition of prediabetes using three glycemic indices of FPG, PPG and HbA1c made these result reliable and convincing. In our study, we found PPG had a higher risk of renal dysfunction. The reason might be that the postprandial plasma glucose is characterized by the rapid and large increase of blood glucose concentrations, which produces an increase of glomerular filtration rate in kidney [23]. The hyperperfusion results in a greater stimulus for hyperproduction of collagen which was considered an important event for pathogenesis of diabetic nephropathy [24]. Simultaneously, blood flow was also closely parallel with plasma glucose concentrations [25], which both pathogenetic factors are important to the occurrence and progression of kidney dysfunction.

 Table 2 

Risk of renal dysfunction with prediabetes defined by ADA criteria

Events/NModel 2Model 3
OR (95%CI)P valueOR (95%CI)P valueOR (95%CI)P value
NGT30/2694 (1.11)1.001.001.00
Prediabetes91/4321 (2.10)1.91 (1.46-2.96)<0.0011.83(1.23-2.79)0.0011.72(1.11-2.38)0.001
IFG34/1831(1.84)1.67 (1.34-2.72)<0.0011.52(1.21-2.08)0.0041.48(1.09-1.93)0.004
IGT42/1589(2.64)2.38 (1.72-3.86)<0.0012.12(1.41-3.03)<0.0011.97(1.27-2.89)<0.001
EHbA1c62/3607(1.71)1.56 (1.26-2.37)<0.0011.40 (1.22-2.40)0.0031.35(1.07-2.13)0.008

OR and 95%CI are from logistic regression;

Model 1 unadjusted for covariates;

Model 2 adjusted for age, sex and BMI;

Model 3 adjusted for age, sex, BMI, TC, TG, HDL-C, LDL-C, SBP, and DBP.

NGT: normal glucose tolerance HbA1c: glycosylated hemoglobin. IFG: impaired fasting glucose. IGT: impaired glucose tolerance. EHbA1c: Elevated glycated hemoglobin A1c. OR: odds ratio. CI: confidence interval.

 Figure 2 

Subgroup analysis of risk of renal dysfunction with prediabetes defined by ADA criteria NGT: normal glucose tolerance HbA1c: glycosylated hemoglobin. IFG: impaired fasting glucose. IGT: impaired glucose tolerance. EHbA1c: Elevated glycated hemoglobin A1c. OR: odds ratio. CI: confidence interval.

Int J Med Sci Image
 Table 3 

Receiver operating curve analysis of glucose indices for prediction of renal dysfunction

AUC (95%CI)Sensitivity (%)Specificity (%)Youden indexCutoff point
ROC
FPG0.58 (0.56-0.61)54.6 (45.2-63.1)66.1 (57.4-75.6)0.2075.57 mmol/L
PPG0.63 (0.61-0.65)68.3 (59.5-76.4)66.7 (58.5-75.1)0.3507.29 mmol/L
HbA1c0.60 (0.58-0.61)71.3 (61.1-80.6)55.4 (44.7-64.2)0.2675.65 %
ADA criteria
FPG-54.4 (45.3-64.1)65.5 (56.3-74.9)0.1995.6 mmol/L
PPG-50.7 (39.8-59.9)71.4 (62.0-80.2)0.2217.8 mmol/L
HbA1c-75.8 (65.5-84.7)51.3 (40.4-61.4)0.2715.7 %
WHO criteria
FPG-32.1 (21.1-43.5)86.2 (81.3-90.4)0.1836.1 mmol/L
PPG-50.7 (39.5-59.8)71.4 (66.2-76.7)0.2217.8 mmol/L

AUC: area under curve. FPG: fasting plasma glucose. PPG: postprandial plasma glucose. ADA: American Diabetes Association.

There are some major strengths in this study. It was a multi-community and well-designed prospective study, which confirmed a robust and convincing conclusion. Furthermore, simultaneous assessment of glycemic indices of FPG, PPG and HbA1c could identify as many prediabetes participants as possible, thus avoiding selective bias caused by misdiagnosis. Lastly, this study benefited from detailed information of standardized procedures such as face-to-face visit, physical examination and laboratory test for each participant, guaranteeing to collect all potential confounding factors. However, there are some limitations in this study. Firstly, participants enrolled were aged 40 years and more, which may produce potential bias and poor extrapolation. Secondly, urinary albumin was not detected in study investigation, which leads to underestimate of renal dysfunction participant. Thirdly, the relatively short follow-up time resulted in few renal dysfunction events, and further study of delaying follow-up time will be necessary for the reproducibility.

In summary, our findings showed prediabetes was positively associated with renal dysfunction in Chinese middle-aged and elderly. PPG presented a higher risk and stronger predictive value for renal dysfunction. The results emphasize that prediabetes should be pay more attention, especially for IGT individuals, in order to attenuate the risk of renal dysfunction even nephropathy occurrence.

Abbreviations

ADA: America diabetes association; AUC: area under curve; CI: confidence interval; EHbA1c: elevated hemoglobin A1c; FPG: fasting plasma glucose; HDL-C: high density lipoprotein cholesterol; IFG: impaired fasting glucose; IGT: impaired glucose tolerance; LDL-C: low density lipoprotein cholesterol; OR: odds ratio; PPG: postprandial plasma glucose; ROC: receiver operating characteristic curve; TC: total cholesterol; TG: triglyceride; WHO: world health organization.

Acknowledgements

The authors thank all community doctors who were involved in the investigation for their contribution of data collecting and quality control.

Ethics approval

This study was approved by the Committee on Human Research of the Xuanwu Hospital, Capital Medical University.

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding address Corresponding author: Dr. Guangfeng Liu, Department of Emergency, Feicheng Traditional Chinese Medicine Hospital, Taian, Shandong, 271600, China, E-mail address: sdfclgfcom., and PhD Yongbo Yu, Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Children's Hospital, Capital Medical University, Beijing, 100045, China, E-mail address: yuyongbo1688com.


Received 2020-3-30
Accepted 2020-5-19
Published 2020-6-18


Citation styles

APA
Chen, C., Liu, G., Yu, X., Yu, Y., Liu, G. (2020). Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study. International Journal of Medical Sciences, 17(11), 1515-1521. https://doi.org/10.7150/ijms.46477.

ACS
Chen, C.; Liu, G.; Yu, X.; Yu, Y.; Liu, G. Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study. Int. J. Med. Sci. 2020, 17 (11), 1515-1521. DOI: 10.7150/ijms.46477.

NLM
Chen C, Liu G, Yu X, Yu Y, Liu G. Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study. Int J Med Sci 2020; 17(11):1515-1521. doi:10.7150/ijms.46477. https://www.medsci.org/v17p1515.htm

CSE
Chen C, Liu G, Yu X, Yu Y, Liu G. 2020. Association between Prediabetes and Renal Dysfunction from a Community-based Prospective Study. Int J Med Sci. 17(11):1515-1521.

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