- Research article
- Open Access
Factors associated with Health-Related Quality of Life in Kidney Transplant Recipients in France
BMC Nephrology volume 19, Article number: 99 (2018)
Health-Related Quality of Life (HRQoL) assessment after kidney transplantation has become an important tool in evaluating outcomes. This study aims to identify the associated factors with HRQoL among a representative sample size of Kidney Transplant Recipients (KTR) at the time of their inclusion in the study.
Data of this cross-sectional design is retrieved from a longitudinal study conducted in five French kidney transplant centers in 2011, and included KTR aged 18 years with a functioning graft for at least 1 year. Measures include demographic, psycho-social and clinical characteristics. To evaluate HRQoL, the Short Form-36 Health Survey (SF-36) and a HRQoL instrument for KTR (ReTransQol) were administered. Multivariate linear regression models were performed.
A total of 1424 patients were included, with 61.4% males, and a mean age of 55.7 years (±13.1). Demographic and clinical characteristics were associated with low HRQoL scores for both questionnaires. New variables were found in our study: perceived poor social support and being treated by antidepressants were associated with low scores of Quality of Life (QoL), while internet access was associated with high QoL scores.
The originality of our study’s findings was that psycho-social variables, particularly KTR treated by antidepressants and having felt unmet needs for any social support, have a negative effect on their QoL. It may be useful to organize a psychological support specifically adapted for patients after kidney transplantation.
In public health and medicine, Health-Related Quality of Life (HRQoL) measurements have become an important outcome measure in addition to morbidity and mortality rates, both in population health assessment and in clinical trials [1, 2]. HRQoL is a multi-dimensional concept that includes domains related to physical, mental, emotional, and social functioning. It goes beyond direct measures of population health, life expectancy and causes of death, and focuses on the impact that health status has on Quality of Life (QoL) . In addition to its multidimensional nature, one important reason to measure the HRQoL is establishing and expanding information about the range of problems that affect the patients [3,4,5].
In general, chronic diseases are increasingly widespread . The World Health Organization (WHO), therefore, prioritizes HRQoL improvement for people living with chronic diseases . In France, the August 9, 2004 public health law applied this priority, implementing a national plan to improve the HRQoL for people living with chronic diseases, mainly those with End-Stage Renal Disease (ESRD) . The French Biomedicine Agency and the National Institute for Public Health Surveillance have promoted studies to determine the level of HRQoL of ESRD patients in France in order to improve the HRQoL of chronic disease patients [9, 10].
When compared with dialysis, renal transplantation has become the most cost-effective treatment [11,12,13] for ESRD patients, as it presents medical costs reduction, extended lifetime  and enhanced HRQoL [11, 15, 16].
Although the HRQoL advantages in Kidney Transplant Recipients (KTR) were established [11, 14, 16,17,18,19,20,21], life after kideny transplantation may present negative as well as positive aspects. Therefore, it is essential to describe the demographic and clinical factors that influence HRQoL outcomes. Furthermore, most published studies did not clearly explore the psycho-social variables that potentially can affect the QoL. This study aims to identify factors associated with HRQoL through a comprehensive analysis of demographic, psycho-social and clinical characteristics among a representative cohort of KTR living in France.
Study design and patients
This is a cross-sectional design retrieved from a longitudinal study carried out continuously during the year 2011, in five French kidney transplant centers: Marseille, Montpellier, Nice, Paris and Nantes University Hospitals. All patients aged 18 years and older with a functioning graft for at least one year were eligible for the study. Multi-organ transplant patients before or simultaneously with their kidney transplant were excluded.
Data collection and measures
Patients were included in 2011 during their regular medical visits. Data of inclusion, including demographic, psycho-social characteristics and HRQoL, were directly collected from the patients who agreed to participate, except health data which were obtained from nephrologists.
Demographic and psycho-social characteristics
Demographic and psycho-social variables collected were:
➢ Age, gender, level of education: primary or less, college, secondary 1st stage and university
➢ Living arrangement: alone or not alone
➢ Having children or not, employment status: employed, retired, unemployed
➢ Disability pension: patients receiving disability pension or not
➢ Monthly incomes in the household (€)
➢ Internet and social network use
➢ Social support: done by a perceived questionnaire, used to estimate the availability and the quality of this support . It is composed of four main scales: esteem, financial, informative and emotional supports. For each scale, patients were asked to answer if they were in need for this support or not.
Medical measures were grouped into four domains related to kidney disease, health status and comorbidities, treatments (i.e. drugs) along with their side effects and biological data.
To explore kidney disease: we collected the etiology of End-Stage Renal Disease (ESRD), the previous dialysis treatment and duration, the duration since transplantation, the organ donor type (cardiac death, deceased or living-related donor), the organ transplantation (one or two simultaneous kidney grafts), the number of transplantations, the graft rejection episodes and the graft chronic dysfunction.
To explore health status and comorbidities: we collected the pathologies frequently associated with KTR (neoplasia, hypertension, and diabetes mellitus), smoking status, Body Mass Index (BMI) and the two validated scales: The Karnofsky Performance Scale (KPS) and The Charlson Comorbidity Index (CCI).
The Karnofsky Performance Scale (KPS) was evaluated to classify patients according to their functional impairment from 0 to 100%. The lower the Karnofsky score, the worse the survival for most serious illnesses was [23, 24].
The Charlson Comorbidity Index (CCI) was evaluated to classify patient’s comorbidities. According to Charlson et al. , the CCI was calculated by assigning for each pathology a score of 1, 2, 3, or 6, depending on the death risk associated with each one and by summing the weights for all present comorbid conditions (ranges from 0 to 37). For the combined age-comorbidity score, each decade of age over 40 adds 1 point to the risk (e.g. 50–59 years, 1 point; 60–69 years, 2 points; 70–79 years, 3 points…) . Higher scores indicate greater comorbidity.
To explore treatments and their side effects, we collected treatment characteristics. We generated with nephrologists a selective list of the most commonly prescribed drugs with their generic names, previously used in a recent publication . This list includes the most used categories of treatments by KTR: immunosuppressive, antihypertensive and other treatments. For each category, we obtained its corresponding drugs. Then, we asked the patients for the existence of side effects related to treatments, without specifying the type.
To explore biological data: we collected creatinine and hemoglobin (Hb) levels directly from nephrologists during the medical visit. Creatinine levels were defined by establishing 3 categories with nephrologists (normal < 120 μmol/L, mild to moderate: 120–250 μmol/L, severe > 250 μmol/L). Anemia was defined by using the World Health Organization (WHO) criteria, which meant that the Hb concentration was below 12 g/dl in women and below 13 g/dl in men .
Health-related quality of life
HRQoL was measured with the SF-36 and the ReTransQol. French version of the SF-36 [29, 30] is a generic, self-administered, multidimensional and coherent measure of HRQoL that consists of 36 items, which are used to calculate eight subscales: Physical Functioning (PF), Role Physical (RP), Bodily Pain (BP), General Health (GH), Vitality (VT), Social Functioning (SF), Role Emotional (RE), and Mental Health (MH). The correlated physical (PCS) and mental (MCS) summary components were computed following the standardized procedure provided by authors [27, 31, 32].
The ReTransQol version 2 [33, 34] is a disease specific self-administered instrument assessing the HRQoL of KTR and consisting of 32 items describing 5 dimensions: Physical Health (PH), Mental Health (MH), Medical Care and satisfaction (MC), Treatment (TRT), and Fear of losing the Graft (FG).
Scores for both instruments range from 0 to 100, with higher scores indicating better HRQoL.
The study methodology was approved by the local Institutional Review Board (CCTIRS n°12-726) and the “Comité National Informatique et Liberté” (CNIL n°1639707), thus ensuring the confidentiality of all the collected informations. All patients agreeing to participate signed a written informed consent before their inclusion in the study.
Statistical analysis was performed using Statistical Package for Social Sciences (SPSS) software (version 20, SPSS, Inc., Chicago, IL, USA). Quantitative data were expressed as mean ± standard deviation (SD), minimum and maximum or median, 25th and 75th percentiles, whereas categorical data were expressed as frequency and percentage. Group comparisons were performed using analysis of variance (bivariate analysis) for quantitative variables. All factors with a p-value < 0.2 were included as candidate variables in the multivariate analysis. Multivariate Linear Regression models (MLR) were used to estimate the relationship between HRQoL scores and the other characteristics. The β coefficients and p-value were performed. The level of significance was set at a p-value ≤0.05. The assumptions of the MLR were verified for linear relationship, normality of distribution, absence of multicollinearity and residuals. Because missing data were minimal (< 10%), we did not replace them and we only analyzed the available ones (i.e. ignoring the missing data).
At the time of the survey, 1469 KTR met eligible criteria for the study during 2011. Among them, 45 patients (3.1%) without QoL questionnaires were excluded from this study and 1424 were included and selected for analysis. Thus, the participation rate is 96.9%.
As presented in Table 1, patient’s mean age was 55.7 years (± 13.1), more than 60% were males and lived with a partner. Less than 40% attended college and were employed at the time of the survey. The majority of KTR had access to internet in the household. Moreover, most of KTR declared having felt a need for an esteem support more than the other supports.
Regarding the clinical characteristics (Table 2), more than a third of KTR had glomerulonephritis and the majority were dialyzed before transplantation. Median time since transplantation was 7.1 years. Most of patients had a deceased donor transplantation and had a single kidney transplantation. The mean CCI score was 4.09 (± 1.8, range from 2 to 14), and most of KTR had mild to moderate creatinine level (50.8%). Other characteristics about clinical characteristics are shown in Table 2. Most patients were treated with immunosuppressive drugs. Nearly 28% of KTR reported side effects related to treatments with a mean number of side effects of 6.4 ± 1.7 per patient (Table 3).
Health related quality of life
Figure 1 shows the mean HRQoL scores and their SD for the eight components of the SF-36 and the five components of the ReTransQol.
Multivariate regression analysis
We selected all variables in the final regression model for both questionnaires (SF-36 and ReTransQol) according to their significance in the univariate analysis (p < 0.2).
Adjusted differences in the ten generic dimensions of SF-36 and in the five specific dimensions of ReTransQol using demographic, psycho-social and clinical variables are shown in Tables 4 and 5, respectively.
All HRQoL components of SF-36 and RTQ were lower with demographic and clinical characteristics. The variables which contributed most to low QoL scores were receiving disability pension, low monthly incomes and a low Karnofsky Performance Scale (< 70%). To a lesser extent, advanced age, female gender, having children, unemployment, living alone, a high Charlson Comorbidity Index, high creatinine levels (> 250 μmol/L), chronic graft dysfunction, being treated with cardiovascular drugs and presence of side effects related to treatments were associated with low QoL scores (Tables 4 and 5).
Psycho-social variables were also found to be associated with HRQoL scores for both questionnaires. Perceived poor social support and being treated by antidepressants were associated with low scores of QoL, while internet access was associated with high QoL scores (Tables 4 and 5).
This study analyzed the factors associated with HRQoL in a representative sample of 1424 Kideny Transplant Recipients (KTR) from five kidney centers of France. This study goes further from a previous work published in a French national study of 1061 KTR from 8 regions of France, which was the first French report about HRQoL in kidney transplantation . We analyzed the exploration of psycho-social factors that were poorly studied in literature, such as perceived social support measured by a validated questionnaire  and internet access. Indeed, there is growing evidence for the necessity of specifying psychological dimension’s influence on quality of life after kidney transplantation [35, 36].
In our study, HRQoL scores, socio-demographic and clinical characteristics of KTR are similar to a French national survey . Socio-demographic variables had a negative influence on HRQoL: level of HRQoL significantly decreases with age, female gender, living status and the educational level. These findings are in accordance with other studies [27, 37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52].
This study points out that KTR receiving a disability pension have an extremely impaired HRQoL, especially for physical dimensions. This association may be influenced by the impact of manual work . Patients in lower-ranked occupations may have less control in the work situation and thereby less possibility to prevent their health influenced by physical demands and poor ergonomic working environment .
Karnofsky Performance Status (KPS) was strongly associated with good HRQoL scores, whatever the instrument used. Whether KTR could carry normal activity and take care of themselves are the important parameters of measurement of QoL. Zhang L et al.  suggested that KPS score could be the most important factor associated with QoL values in patients with advanced HIV. These results suggest that healthy lifestyle and physical function are recommended after transplantation to improve HRQoL and it seems important to counsel and encourage for more physical activity as a part of routine medical care in KTR.
Furthermore, treatments with diabetic, cardiovascular and calcium drugs had a negative impact on HRQoL, especially for physical dimensions. In contrast, we did not find any association between immunosuppressive drugs and HRQoL, which suggests that nephrologists should use more effective treatments to prevent rejection and preserve the kidney function without adversely affecting HRQoL. A specific health education for KTR, including how treatments must be adhered, its benefits and side effects, is also recommended for KTR to handle difficulties due to specific treatments.
We also found a strong association between antidepressants and bad HRQoL scores for both physical and mental components. It is possible that patients treated with antidepressants tended to somatize more and give more emphasis to the negative effects of transplantation than its positive effects [56, 57]. It could also suggest that patients with worse health conditions are more susceptible to depression, even after transplantation. Studies reported that patients undergoing dialysis and/or transplantation, may become unable to cope with it, as it affects their mind integrity . Depression and anxiety as impaired HRQoL are known to be associated with increased mortality and poor outcomes in KTR [59, 60]. Mental health is thus playing an important role in HRQoL and should not be underestimated after kidney transplantation.
Aside from these factors, social support was significantly associated with bad HRQoL scores. KTR with a need for an esteem and emotional support have bad QoL scores in almost all dimensions and specifically in mental dimensions (Tables 4 and 5). This underlies that social support may reflect non-constructive coping strategies with the disease, which should not be underestimated. Furthermore, informative support and internet access were associated with high QoL scores for mental dimension of ReTransQol (Table 5), testifying their interest in seeking for information and communication about their health or their transplant, and arguing the need for progress in these fields. These results are in accordance with previous studies, which demonstrated that Internet could improve the well-being and QoL by providing mental stimulation and challenge .
Summing up, these new findings reinforce the importance of patients’ psychological health and strengthen the necessity of psychosocial development and support for these patients. Our patients may, after kidney transplantation, need more psychological interventions aiming to provide information about their medical care. This could help them to deal with their disease and reduce several mental problems (such as stress and anxiety). Therefore, for better post-transplant rehabilitation and given the risks of psychopathology, the development of interdisciplinary interventions such as socio-medical and psychotherapeutic programs are essential.
Finally, our sample is representative of general French KTR with a large sample size. To our knowledge, there are few studies with a sample over 1000 patients [17, 62, 63]. Another strong point of the current study was the use of generic and specific HRQoL tools. We applied the generic instrument SF-36 Health Survey [29, 30], the most used questionnaire for HRQoL analysis in KTR [64,65,66,67], and a disease-specific instrument validated for KTR in the French language: the ReTransQol version 2 . Both questionnaires are very interesting to work with, as they are complementary and offer different views on the global aspects and the specific domains to identify factors associated with HRQoL for KTR. Indeed, RTQ was more sensitive than SF-36 for clinical variables such as treatment and fear of losing the graft, but less exhaustive for demographic factors. Another strong point of this study was the construction of a comprehensive multivariate model, including many variables, especially psycho-social ones that were poorly studied in QoL studies for KTR. Despite being comprehensive, the final regression models explained 20% of the physical (PCS) HRQoL variance and 18% of mental HRQoL variance (MCS). Limitations of our research are related to the cross-sectional design, which is the first phase of our longitudinal study, so we cannot truly interpret predictive factors. The longitudinal data are currently under analysis to compare HRQoL scores, its evolution over time and its associated factors.
The originality of our study’s findings was that new variables, particularly KTR treated by antidepressants and having felt unmet needs for any social support, have a negative effect on their QoL. It may be useful to organize a psychological support specifically adapted for these patients. In order to orientate psychological programs and improve patient care and well-being, a better understanding of how patients anticipate, live and face post-kidney-transplantation and a deep investigation of psychological factors are needed in future QoL studies.
Body Mass Index
Charlson Comorbidity Index
End-Stage Renal Disease
Fear of losing the Graft
Health-Related Quality of Life
Karnofsky Performance Scale
Kidney Transplant Recipients
Medical Care and satisfaction
Mental Composite Score
Multivariate Linear Regression
Physical Composite Score
Quality of Life
Short Form-36 Health Survey
World Health Organization
- β coeff:
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The authors would like to thank patients, nephrologists and clinical technicians for their help and participation to this study.
This study is integrated in a research program funded by: Direction Générale de l’Offre de Soins, Ministère des affaires sociales et de la santé, for study design and data collection. Authors declare that they have no conflicts of interest regarding this funding source. Analysis, interpretation of data and writing of the manuscript were not associated with any funding.
Availability of data and materials
All data generated or analyzed during this study are included in this article. The datasets of this study are not publicly available at present. As it is a longitudinal study, all data are under analysis for the publication of other articles/studies, but they can be available from the corresponding author on reasonable request.
Ethics approval and consent to participate
The study methodology was approved by the local Institutional Review Board (CCTIRS n°12-726) and the “Comité National Informatique et Liberté” (CNIL n°1639707), thus ensuring the confidentiality of all the collected informations. All patients agreeing to participate signed a written informed consent before their inclusion in the study.
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Mouelhi, Y., Jouve, E., Alessandrini, M. et al. Factors associated with Health-Related Quality of Life in Kidney Transplant Recipients in France. BMC Nephrol 19, 99 (2018). https://doi.org/10.1186/s12882-018-0893-6
- Cross sectional
- Health-related quality of life
- Kidney Transplant Recipients