Real-World Impact of Cardiovascular Disease and Anemia on Quality of Life and Productivity in Patients with Non-Dialysis-Dependent Chronic Kidney Disease
verfasst von:
Adrian Covic, James Jackson, Anna Hadfield, James Pike, Dimitrie Siriopol
Patients with chronic kidney disease (CKD) have an increased risk of comorbid conditions, including cardiovascular disease (CVD). Anemia is prevalent in the CKD population and worsens as kidney function declines, resulting in a diminished quality of life and increased morbidity/mortality. The purpose of this secondary analysis was to determine the real-world prevalence of CVD among patients with non-dialysis-dependent CKD (NDD-CKD), with and without comorbid anemia, and to assess the impact of these conditions on quality of life (QoL) and work productivity.
Methods
Data were drawn from the Adelphi CKD Disease-Specific Programme, conducted in France, Germany, Italy, Spain, and the UK (2012). Anonymized data were collected via patient record forms and patient-completed questionnaires. Patient data were stratified by anemic status and the presence of CVD comorbidity.
Results
Data were collected by physicians for 1993 patients, of whom 867 completed a patient-completed questionnaire. A total of 61.4% of patients had anemia, and the prevalence of anemia increased with CKD stage. Patients with anemia had a higher mean number of cardiovascular comorbidities than non-anemic patients (1.27 vs 0.95, respectively; P < 0.001). The presence of cardiovascular conditions was associated with a significantly reduced QoL (EuroQol EQ-5D-3L visual analog scale: coefficient, −5.68 in anemic patients; P = 0.028) and work productivity and activity impairment (WPAI activity impairment: coefficient, +8.04 in anemic patients; P = 0.032), particularly among anemic patients.
Conclusions
The presence of anemia in this cohort of NDD-CKD patients was high. The presence of concomitant cardiovascular conditions was more common in NDD-CKD patients with comorbid anemia, and was associated with reduced QoL and work productivity outcomes.
Abnormal renal structure or function persisting for more than 3 months, defined as chronic kidney disease (CKD), has an estimated prevalence of 3.9–12.5% globally [1, 2]. Diagnosis and disease staging are based on kidney function, measured by glomerular filtration rate, and patients with stage 5 disease (glomerular filtration rate <15 mL/min/1.73 m2) frequently require dialysis [3]. Patients with CKD are at an increased risk of numerous comorbidities, and kidney function is predictive of such complications [4]. In particular, patients with CKD are at an increased risk of cardiovascular disease (CVD) compared with the general population. Although traditional risk factors for CVD, such as abnormal cholesterol profile, smoking, or physical inactivity, are frequently prevalent among patients with CKD, several large prospective studies have demonstrated that CKD itself remains an independent risk factor for CVD [4].
Anemia is a common complication of CKD that becomes more prevalent with declining kidney function, and is associated with reduced quality of life (QoL) and higher morbidity and mortality [5‐7]. Endogenous erythropoietin (EPO) is the hormone responsible for stimulating erythropoiesis, and is primarily produced in response to hypoxia by renal interstitial fibroblasts and is mediated by hypoxia-inducible factor [8, 9]. Although the pathophysiology of anemia in CKD is not fully understood, it has been postulated that transition of these erythropoietin-producing cells to myofibroblasts reduces the number of cells that can produce EPO in response to hypoxia [10]. The development of recombinant human EPO (rHuEPO) has brought clinical and QoL improvements for patients with anemia. Recent evidence has shown that treatment with rHuEPO in predialysis patients with CKD may reduce mortality risk following initiation of dialysis [11]. However, evidence has demonstrated that treatment with rHuEPO to achieve higher Hb levels is associated with increased of cardiovascular (CV) events [12‐15]. As a result, current recommendations advocate individualized treatment to balance the potential benefits and risks for each patient [16].
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To achieve optimal outcomes with these treatments, the impact of CVD and anemia among patients with CKD needs to be elucidated. The purpose of this secondary analysis was to determine the real-world prevalence of CVD among patients with non-dialysis-dependent CKD (NDD-CKD), with and without comorbid anemia, and to assess the impact of these conditions on QoL and work productivity.
Methods
Compliance with Ethics Guidelines
This study was based on a market research survey adhering to the International Chamber of Commerce (ICC)/European Society for Opinion and Marketing Research (ESOMAR) international code on market and social research and therefore ethical approval was not sought.
Study Design
This was a multinational, cross-sectional survey of clinical practice conducted by Adelphi Real World (Bollington, UK). The Adelphi CKD Disease-Specific Programme (DSP) collected detailed information on patients, including the presence of concomitant conditions, particularly those relating to CVD, among anemic and non-anemic patients with moderate to end-stage CKD in Europe. Data for this secondary analysis were collected between June 2012 and September 2012 in France, Germany, Italy, Spain, and the UK and included patients with stage 3 [estimated glomerular filtration rate (eGFR) ≥30 and <60] or 4 (eGFR ≥15 and <30) NDD-CKD. Figure 1 shows the study design, and a detailed description of the DSP methodology is provided elsewhere [17]. Informed consent was provided before collection of patient-reported data. Data were collected anonymously, with respondents identified by study numbers that were matched to linked responses from physicians and their respective patients.
Fig. 1
Study design
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Participants
Physicians (i.e., nephrologists and endocrinologists) who were qualified between 1971 and 2009, and who were actively involved in the drug management of patients with CKD, were eligible for participation. Nephrologists were required to enroll eight NDD-CKD patients, and endocrinologists were required to enroll 14 NDD-CKD patients (diagnosed previously or on the day of enrollment). Patients were classified as anemic if they had a physician-confirmed diagnosis of anemia, were prescribed treatment for anemia, or had a hemoglobin (Hb) level <12 g/dL (women) or <13 g/dL [men; per 2012 Kidney Disease: Improving Global Outcomes (KDIGO) Clinical Practice Guideline].
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Outcome Measures
Physicians completed patient record forms comprising questions related to patient demographics, underlying cause of NDD-CKD, presence of anemia and other concomitant conditions, prescribed treatment, factors influencing treatment selection, and current symptoms (see Supplementary Table 1 for a full list of the terms used). As hypertension is a primary underlying cause of CKD, the association between this outcome and the presence of anemia was assessed. Patient self-completion forms were completed by the enrolled patients, and included the EuroQol EQ-5D-3L, the Kidney Disease Quality of Life (KD-QoL 36) instrument, and the Work Productivity and Activity Impairment (WPAI) questionnaire.
Statistical Analysis
Data were analyzed statistically using Stata v13.1 (StataCorp. 2013. Stata Statistical Software: Release 13. College Station, TX: StataCorp LP). Additional analyses were also performed using the QPSMR Reflect Database. Analyses were performed on the total patient population as well as on the following subgroups: presence of CV comorbidity, no presence of CV comorbidity, presence of anemia, and no presence of anemia.
Multivariable logistic regression analysis was used to calculate odds ratios for the presence of comorbid conditions and the underlying cause of CKD being hypertension among patients with anemia. Multivariable negative binomial regression analysis was used to calculate an incidence rate ratio for the number of comorbid conditions among patients with anemia. Regressions were adjusted for age, gender, diabetes as an underlying cause of CKD, and body mass index (BMI). Multivariable linear regression analysis was used to determine the impact of CV comorbidities on QoL and activity impairment measures in patients with anemia versus patients without anemia. Regressions were adjusted for age, gender, diabetes as an underlying cause of CKD, and BMI. For bivariate associations between patient characteristics and CV comorbidities, analysis was performed using Fisher’s exact test or Chi-square test (for categorical variables), and Mann–Whitney test or Kruskal–Wallis test (for continuous variables).
Results
Patient Characteristics
In total, 242 physicians (216 nephrologists and 26 endocrinologists) participated in the study and provided data for 1993 patients with stage 3–4 NDD-CKD. Patient demographics and characteristics are summarized in Table 1. Most patients (1223; 61.4%) were classified as anemic [physician-confirmed diagnosis of anemia, n = 636 (31.9%); prescribed treatment for anemia, 698 (35%); Hb level <12 g/dL (women) or <13 g/dL (men), 1097 (55%)] and, compared with non-anemic patients, were older and more likely to be male. Approximately 35% of patients were receiving angiotensin-converting enzyme (ACE) inhibitors; the use of ACE inhibitors was not different between anemic and non-anemic patients. There were also differences between these two groups with regard to employment status, with significantly more anemic patients being unemployed or retired. Self-completion forms were completed by 867 matched patients, who provided QoL and work productivity and activity impairment data.
Table 1
Patient demographics and baseline characteristics by anemia status
Characteristics
Non-anemic (n = 770)
Anemic (n = 1223)
Total population (N = 1993)
P value
Male, n (%)
421 (54.7)
767 (62.7)
1188 (59.6)
<0.001
Age (years)
62.5 (14.8)
66.5 (14.5)
64.9 (14.7)
<0.001
BMI (kg/m2)
27.1 (5.0)
26.7 (4.9)
26.9 (5.0)
0.209
Years since CKD diagnosis
0.93 (1.3)
0.94 (0.98)
0.94 (1.1)
0.17
Years since anemia diagnosis
–
1.7 (3.6)
–
–
Systolic blood pressure (mmHg)
138.1 (16.6)
138.5 (17.5)
138.4 (17.2)
0.554
Diastolic blood pressure (mmHg)
78.0 (11.6)
77.6 (11.8)
77.7 (11.8)
0.735
Smoking status, n (%)
0.633
Smoker
82 (11.8)
129 (11.7)
211 (11.8)
Ex-smoker
240 (34.4)
402 (36.6)
642 (35.7)
Never smoked
375 (53.8)
568 (51.7)
943 (52.5)
Years smoked
(current smokers)
24.6 (12.5)
28.4 (14.5)
26.9 (13.8)
0.065
Daily cigarettes
(current smokers)
13.5 (6.3)
14.6 (7.9)
14.2 (7.3)
0.438
Employment status, n (%)
<0.001
Employed
257 (34.2)
207 (17.5)
464 (24.0)
Unemployed
40 (5.3)
87 (7.3)
127 (6.6)
Retired
366 (48.7)
744 (62.8)
1110 (57.4)
Other
88 (11.7)
146 (12.3)
234 (12.1)
Living circumstances, n (%)
0.012
Alone
146 (19.7)
228 (19.5)
374 (19.5)
With friends, spouse, partner, or other family
572 (77.1)
878 (74.9)
1450 (75.8)
Nursing home, sheltered housing, or homeless
14 (1.9)
55 (4.7)
69 (3.6)
Other
10 (1.4)
11 (0.9)
21 (1.1)
Number of concomitant CV conditions*
0.95 (1.1)
1.27 (1.3)
1.15 (1.2)
<0.001
Underlying cause of CKD: hypertension
392 (51.4)
719 (59.4)
1111 (56.3)
<0.001
Underlying cause of CKD: diabetes
336 (44.0)
512 (42.3)
848 (43.0)
0.455
Concomitant conditions, n (%)
Dyslipidemia
316 (41.6)
536 (44.3)
852 (43.3)
0.243
Coronary heart disease
109 (14.4)
270 (22.3)
379 (19.3)
<0.001
Peripheral arterial disease
57 (7.5)
207 (17.1)
264 (13.4)
<0.001
Heart failure
52 (6.9)
136 (11.2)
188 (9.6)
0.001
Arrhythmia
53 (7.0)
116 (9.6)
169 (8.6)
0.047
Heart attack/MI/UA
35 (4.6)
83 (6.9)
118 (6.0)
0.041
Other CV
43 (5.7)
73 (6.0)
116 (5.9)
0.769
CVA/TIA
32 (4.2)
76 (6.3)
108 (5.5)
0.053
Stroke
22 (2.9)
44 (3.6)
66 (3.4)
0.441
Concomitant treatment, n (%)
0.598
ACE inhibitor
271 (35.2)
445 (36.4)
716 (35.9)
Data are presented as mean (SD) unless otherwise noted. P values compare anemic and non-anemic patients and are calculated from Fisher’s exact test, Chi-squared test (categorical variables), a Mann–Whitney test or Kruskal–Wallis test (continuous variables), or a Mann–Whitney test (*only)
ACE angiotensin-converting enzyme, BMI body mass index, CKD chronic kidney disease, CV cardiovascular, CVA cerebrovascular accident, CVD cardiovascular disease, MI myocardial infarction, SD standard deviation, TIA transient ischemic attack, UA unstable angina
Relationship Between Cardiovascular Disease and Anemia
On the basis of patient record forms, the most frequent concomitant conditions experienced by both anemic and non-anemic patients were CV-related, followed by metabolic diseases and mental health disorders (Fig. 2). Patients with anemia had more CV-related concomitant conditions than non-anemic patients (non-anemic, 0.95; anemic, 1.27; P < 0.001). Hypertension was the underlying cause of CKD in 51.4% of the total population, and was more prevalent as the underlying cause among anemic patients (59.4%) compared with nonanemic patients (56.3%) (Table 1). Of the CV-related comorbidities, dyslipidemia was the most common condition, and was prevalent in 44.3% and 41.6% of anemic and non-anemic patients, respectively. Compared with non-anemic patients, those with anemia had a significantly higher prevalence of arrhythmia, heart attack/myocardial infarction/unstable angina, coronary heart disease, heart failure, and peripheral arterial disease (Table 1). The complete results of logistic regression for concomitant conditions, using the non-anemic cohort as a reference category, are shown in Table 2. Anemic status remained independently associated with the likelihood of coronary heart disease (odds ratio, 1.41; 95% CI 1.03–1.94; P = 0.032) and peripheral arterial disease (odds ratio, 1.80; 95% CI 1.25–2.60; P = 0.002). Negative binomial modelling demonstrated that anemia was associated with a greater number of concomitant CV conditions (incidence rate ratio, 1.17; 95% CI 1.03–1.31; P = 0.012).
Fig. 2
Concomitant conditions experienced by anemic and non-anemic NDD-CKD patients. *P < 0.001; †P = 0.005; ‡P = 0.008
Table 2
Association between anemia and concomitant CVD conditions
Outcome
Presence of anemia
P value
Underlying cause of CKD: hypertension
1.19
(0.92, 1.53)
0.190
Stroke
0.98
(0.55, 1.76)
0.951
CVA/TIA
1.06
(0.63, 1.78)
0.818
Dyslipidemia
1.04
(0.81, 1.33)
0.760
Arrhythmia
1.09
(0.72, 1.65)
0.676
Heart attack/MI/unstable angina
1.27
(0.83, 1.95)
0.270
Coronary heart disease
1.41
(1.03, 1.94)
0.032
Heart failure
1.43
(0.96, 2.14)
0.080
Peripheral arterial disease
1.80
(1.25, 2.60)
0.002
Other CV
1.12
(0.53, 2.33)
0.768
Number of concomitant CV conditions*
1.17
(1.03, 1.31)
0.012
Values are odds ratios (95% confidence interval) of anemia increasing the likelihood of each outcome (logistic models) or (*) incidence rate ratios (negative binomial models). Dependent variables are the concomitant conditions listed or (*) number of concomitant conditions; independent variable is anemia status. Reference category is the non-anemic group. Regressions are adjusted for age, gender, stage/dialysis status, diabetes as an underlying cause of CKD, and BMI
BMI body mass index, CKD chronic kidney disease, CVA cerebrovascular accident, TIA transient ischemic attack
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Cardiovascular Disease, Anemia, and Quality of Life
In anemic patients, multiple linear regression analysis revealed that the presence of CV conditions was significantly associated with lower QoL, as measured by EQ-5D visual analog scale (VAS) (coefficient, −5.68; 95% CI −10.76 to −0.61; P = 0.028), KD-QoL 36: effects of kidney disease (coefficient, −6.09; 95% CI −11.23 to −0.95; P = 0.021), and KD-QoL 36: SF-12 physical health composite (coefficient, −2.38; 95% CI −4.72 to −0.05; P = 0.046) (Table 3). No associations between the presence of CV conditions and QoL were observed in non-anemic patients or in the total population. Scores for all QoL measures, stratified by anemic status and presence of CV conditions, are presented in Supplementary Table 2.
Table 3
Association between CV conditions and quality of life by anemic status
Characteristics
Non-anemic
(n = 336)
Anemic
(n = 531)
Total population
(N = 867)
EQ-5D health index
0.00 (−0.06 to 0.06)
P = 0.946
−0.06 (−0.12 to 0.00)
P = 0.068
−0.04 (−0.09 to 0.01)
P = 0.093
EQ-5D VAS
1.10 (−4.00 to 6.19)
P = 0.670
−5.68 (−10.76 to −0.61)
P = 0.028
−3.43 (−7.39 to −0.54)
P = 0.090
KD-QoL 36: symptoms/problems
0.69 (−3.72 to 5.09)
P = 0.758
−3.21 (−8.12 to 1.70)
P = 0.198
−2.21 (−5.81 to 1.39)
P = 0.228
KD-QoL 36: effects of kidney disease
1.22 (−4.13 to 6.57)
P = 0.652
−6.09 (−11.23 to −0.95)
P = 0.021
−3.80 (−7.86 to 0.26)
P = 0.066
KD-QoL 36: burden of kidney disease
4.50 (−2.43 to 11.44)
P = 0.201
−4.48 (−10.89 to 1.93)
P = 0.169
−1.63 (−7.05 to 3.79)
P = 0.554
KD-QoL 36: SF-12 physical health composite
−0.47 (−3.25 to 2.31)
P = 0.737
−2.38 (−4.72 to −0.05)
P = 0.046
−1.83 (−3.83 to 0.17)
P = 0.073
KD-QoL 36: SF-12 mental health composite
1.87 (−0.54 to 4.28)
P = 0.127
−1.49 (−3.83 to 0.84)
P = 0.208
−0.26 (−1.96 to 1.44)
P = 0.761
Values are coefficients (95% confidence interval) from ordinary least squares multiple linear regression models. Reference category is those without CV conditions. Regressions are adjusted for age, gender, stage/dialysis status, diabetes as an underlying cause of CKD, and BMI
BMI body mass index, CKD chronic kidney disease, CV cardiovascular, KD-QoL 36 kidney disease quality of life, VAS visual analog scale
Cardiovascular Disease, Anemia, and Work Productivity and Activity Impairment
In anemic patients only, multiple linear regression analysis revealed that the presence of CV conditions was significantly associated with WPAI: activity impairment (coefficient, 8.04; 95% CI 0.70–15.39; P = 0.032) (Table 4). No significant associations between the presence of CV conditions and work activity impairment were observed in non-anemic patients or in the total population. Scores for all WPAI measures, stratified by anemic status and presence of CV conditions, are presented in Supplementary Table 3.
Table 4
Association between CV conditions and work productivity and activity impairment
Characteristics
Non-anemic
(n = 336)
Anemic
(n = 531)
Total population
(N = 867)
WPAI: percentage of work time missed
−1.42 (−4.74 to 1.90)
P = 0.393
6.81 (−0.39 to 14.02)
P = 0.063
2.41 (−1.21 to 6.03)
P = 0.189
WPAI: percentage of work time impaired
−4.22 (−12.50 to 4.07)
P = 0.312
6.81 (−2.31 to 15.92)
P = 0.140
2.19 (−4.78 to 9.15)
P = 0.533
WPAI: overall work impairment
−5.99 (−15.43 to 3.46)
P = 0.209
8.53 (−3.28 to 20.33)
P = 0.153
2.04 (−5.65 to 9.72)
P = 0.599
WPAI: activity impairment
−2.57 (−9.50 to 4.35)
P = 0.463
8.04 (0.70 to 15.39)
P = 0.032
4.31 (−1.35 to 9.97)
P = 0.135
Values are coefficients (95% confidence interval) from ordinary least-squares multiple linear regression models. Reference category is those without CV conditions. Regressions are adjusted for age, gender, stage/dialysis status, diabetes as an underlying cause of CKD, and BMI
BMI body mass index, CKD chronic kidney disease, CV cardiovascular, WPAI work productivity and activity impairment
Discussion
This analysis of multinational, cross-sectional data representing real-world clinical practice confirms a high prevalence of physician-assessed anemia in patients with stage 3–4 NDD-CKD. In this population, anemia was associated with a higher number of concomitant conditions, in particular CVD. The presence of concomitant CVD and anemia was associated with reduced QoL measures and work productivity and greater activity impairment.
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Previous studies have shown that there is a direct relationship between older age and an increased prevalence in anemia, irrespective of renal function [18, 19]. Similar to these studies, we found that patients with anemia were significantly older than those without anemia. A US National Health and Nutrition Examination Survey (NHANES) study found that, in patients with CKD, CVD correlated with CKD severity as well as with age [20]. A UK prospective, observational study in patients with CKD, followed up from the time of diagnosis of diabetes, found that CVD was the most common cause of mortality, and that CVD risk increased with progression of nephropathy from 0.7% in non-nephrotic patients to 12.1% in patients with the most advanced stage of nephropathy (i.e., elevated plasma creatinine or renal replacement therapy). Additionally, the proportion of CV-related deaths increased from 51% in non-nephrotic patients to 75% in patients with advanced nephropathy [21]. It has been suggested that the pathophysiologic mechanisms underlying CKD and CVD may mutually amplify each other, therefore causing a greater impact on patient health [22]. Furthermore, as demonstrated by de Silva et al. [23], a high proportion of patients with CVD have both CKD and anemia, and these two conditions are closely related. In this population, anemia and CKD are associated with increased all-cause mortality, and this risk has been shown to be additive [22, 23].
A recent study demonstrated that anemia in CKD is associated with increased disease burden and activity impairment as well as with diminished QoL [24]. Significantly lower QoL has previously been demonstrated in patients with CKD compared with matched controls, even in early stages of disease, with scores deteriorating at more advanced CKD stages [25]. The current study goes further and shows that, in a CKD population, the presence of both anemia and CVD is associated with a lower QoL, as measured by several QoL measures.
This study has limitations that should be considered when interpreting the results. Selection bias may have occurred as a result of recruiting a selected group of physicians to enroll patients. In addition, because inclusion depended on the patient attending a clinic, patients who attend more frequently were more likely to be enrolled. Although consecutive sampling provides representation of a real-world consulting CKD population, this design may limit the generalizability of the results. Furthermore, less than half of the enrolled patients completed the patient self-completion form that captured QoL data. As participants could have pre-existing CKD, no standardized diagnostic procedure for CKD was used, and adjustments for kidney function were not made. In addition, although the cutoff criteria for anemia were defined in accordance with KDIGO guidelines, patients receiving anemia treatment, or who had a physician-confirmed diagnosis of anemia, were classified as being anemic without further testing. Another limitation of this study is that there are no data on iron parameters (i.e., ferritin, transferrin saturation). It is well known that iron is a crucial element that reduces platelet count and also improves mitochondrial and cardiac function [26, 27]. Understanding more about iron stores can reveal meaningful pathways in the relationship between anemia and CVD in patients with CKD. Lastly, as this was an observational study of data obtained from existing medical records, the non-interventional and cross-sectional design do not allow for any cause and effect inferences to be made.
Conclusions
In this cross-sectional survey of clinical practice, a high prevalence of anemia was found in patients with CKD. CVD comorbidities were more common among anemic patients compared with non-anemic patients, and were associated with significant decreases in QoL indicators.
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Acknowledgements
Sponsorship, article processing charges, and medical writing support were funded by Astellas Pharma, Inc. The authors thank Anusha Bolana, Frances O’Connor, Kay Chapman, and Cleo Hall, of Darwin Healthcare Communications, who provided medical writing and editorial services on behalf of Astellas Pharma, Inc. All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this manuscript, take responsibility for the integrity of the work as a whole, and have given final approval for the version to be published.
This paper is our original work and the results presented have not been published previously in whole or in part, except for in abstract form. All authors contributed equally to the study. AC and DS helped design the analysis, and developed and reviewed the manuscript. JJ, JP, and AH designed and fielded the CKD DSP, analyzed the data used for publication, and reviewed the manuscript.
Disclosures
Adrian Covic, James Jackson, Anna Hadfield, James Pike, and Dimitrie Siriopol have nothing to disclose.
Compliance with Ethics Guidelines
This study was based on a market research survey adhering to the International Chamber of Commerce (ICC)/European Society for Opinion and Marketing Research (ESOMAR) international code on market and social research and therefore ethical approval was not sought.
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Data Availability
The datasets generated during and/or analyzed during the current study are the intellectual property of Adelphi Real World and are not publicly available. However, data can be provided upon request (james.jackson@adelphigroup.com).
Open Access
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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Real-World Impact of Cardiovascular Disease and Anemia on Quality of Life and Productivity in Patients with Non-Dialysis-Dependent Chronic Kidney Disease
verfasst von
Adrian Covic James Jackson Anna Hadfield James Pike Dimitrie Siriopol
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