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Article

Anemia in Elderly Patients—The Impact of Hemoglobin Cut-Off Levels on Geriatric Domains

by
Francesco Salis
1,*,†,
Giambeppe Locci
1,†,
Barbara Mura
1 and
Antonella Mandas
1,2
1
Department of Medical Sciences and Public Health, University of Cagliari, 09127 Cagliari, Italy
2
University Hospital “Azienda Ospedaliero-Universitaria” of Cagliari, 09127 Cagliari, Italy
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Diagnostics 2023, 13(2), 191; https://doi.org/10.3390/diagnostics13020191
Submission received: 17 December 2022 / Revised: 28 December 2022 / Accepted: 2 January 2023 / Published: 5 January 2023
(This article belongs to the Section Clinical Laboratory Medicine)
Versions Notes

Abstract

:
Background: The primary aim of this study was to evaluate the impact of anemia—according to the WHO criteria—on cognitive performances, mood, functional and nutritional status, and comorbidities in a population of subjects aged 65 years or older. The secondary aim of this study was to understand if different hemoglobin cut-off levels are associated with a variation of the mentioned domains’ impairment. Methods: We designed a cross-sectional study, including subjects aged 65 or more consecutively evaluated in an outpatient setting from July 2013 to December 2019. A sum of 1698 subjects met the inclusion criteria. They were evaluated with: MMSE and CDT (cognitive assessment), GDS (mood), BADL, IADL, PPT, and POMA (autonomies), MNA (nutritional status), and CIRS (comorbidities). Results: According to the WHO criteria, non-anemic patients reported significantly better performances than the anemics in BADL (p < 0.0001), IADL (p = 0.0007), PPT (p = 0.0278), POMA (p = 0.0235), MNA, CIRS TOT, CIRS ICC, and CIRS ISC (p < 0.0001). The same tendency has been found by considering the 12 g/dL- and the 13 g/dL-cut-off level in the whole population. The multivariate analysis showed that, considering the 12 g/dL-cut-off level, age (OR: 1.03, p = 0.0072), CIRS (OR: 1.08, p < 0.0001), and gender (OR: 0.57, p = 0.0007) were significant regressors of anemia, while considering the 13 g/dL-cut-off level, age (OR: 1.04, p = 0.0001), POMA (OR: 1.03, p = 0.0172), MNA (OR = 0.95, p = 0.0036), CIRS (OR: 1.17, p < 0.0001), ICC (OR = 0.83, p = 0.018), and gender (OR = 0.48, p < 0.0001) were significant regressors of anemia, while the other CGA variables were excluded by the model (p > 0.01). Conclusions: Our study showed that anemia negatively impact on geriatric people’s general status, regardless of which hemoglobin cut-off level is considered. It also highlighted that hemoglobin concentrations < 13 g/dL, regardless of gender, have an association with the impairment of the affective-functional-nutritional state as well as an increase in comorbidities; therefore, it should be pursuable to consider the elderly person “anemic” if Hb < 13 g/dL regardless of gender.

1. Background

With the increasing global average age [1,2,3], greater importance is being assigned to geriatric research. It is known that the complexity of this group of the population is well eviscerated by Comprehensive Geriatric Assessment (CGA) [4], which is performed in order to deepen a variety of clinical and socio-environmental domains and their connections [5,6,7]. One of the most common clinical conditions that can be found in elderly people is represented by anemia [8,9,10], which reaches a prevalence of 17% in people at 65 years or more, growing to more than 20% in the oldest [11]. This condition, according to the World Health Organization (WHO), is defined as serum hemoglobin (Hb) levels lower than 12 g/dL in women and 13 g/dL in men [12], regardless of being adult or elderly. In the geriatric population, anemia is often the expression of a multifactorial impairment [10,13,14,15]. Firstly, the aging process is characterized by a low-grade inflammation [16,17], which leads to hepcidin overexpression, with an altered iron regulation, and, consequently, a lower availability for the bone marrow in hemoglobin synthesis [18]. Moreover, elderly people are often malnourished, especially if institutionalized, due to their more compromised status [19]: iron, folates, vitamin B12, and some other nutrients are frequently deficient [8,10,20,21] and such deficiency causes an alteration of erythroid progenitor cells’ cellular cycle [22]. Another crucial contribution is made by chronic kidney disease (CKD) [23]: it is known that the lower the glomerular filtration, the lower the erythropoietin levels [24], but there is another characteristic element contributing to determine anemia, namely the pro-inflammatory status [25], with toxin accumulation, typical of CKD. Lastly, some anemic forms are difficult to classify and are probably determined by a plethora of factors [26,27,28,29], including vascular aging, endocrine disorders, and taking medications. In addition, with the onset of menopause, women have no reason to have increased bleeding than men [30,31,32], likely not justifying a 1 g/dL difference in hemoglobin levels between genders.
Many studies focus on the biochemical and pathophysiological details of anemia’s genesis, while very fewer studies focus on the importance of considering the elderly as a different population than adult [33,34,35,36]: the possible—and frequent—co-existence of so many factors should lead us to ask whether it is correct to continue considering the mentioned hemoglobin cut-off levels even in elderly people or a revision would be helpful [12].
Leading this line, the present study aims to explore the impact of anemia in influencing different domains in a large population aged 65 or more, considering the WHO criteria and also testing other cut-off levels, regardless of gender.

2. Methods

2.1. Aim of the Study

The primary aim of this study is to evaluate the impact of anemia—according to the WHO criteria—on cognitive performances, mood, functional and nutritional status, and comorbidities in a population of subjects aged 65 years or older.
The secondary aim of this study is to consider if different hemoglobin cut-off levels are associated with a variation of the mentioned domains’ impairment.

2.2. Design of the Study

This cross-sectional study included subjects evaluated at the Geriatric Outpatient Service of the University Hospital of Monserrato, Cagliari, Italy, from July 2013 to December 2019.

2.3. Inclusion Criteria

Age ≥ 65 years; having been subjected to CGA; having taken a venous blood sample for blood count on the occasion of the medical examination or less than one week apart.

2.4. Exclusion Criteria

Age < 65 years; age ≥ 65 years with acute conditions that contraindicated the CGA’s execution (e.g., psychomotor agitation; delirium; inability to sustain attention); having taken a venous blood sample for blood count more than one week apart from the medical examination.
A total of 1698 subjects met the inclusion criteria.

3. Assessment

The enrolled subjects were evaluated with:
  • Mini-Mental State Examination (MMSE) [37] and Clock Drawing Test (CDT) [38], for cognitive assessment;
  • Geriatric Depression Scale (GDS) [39], for mood’s assessment;
  • Basic Activities of Daily Living (BADL), Instrumental Activities of Daily Living (IADL) [40], Physical Performance Test (PPT) [41], and Performance Oriented Mobility Assessment (POMA) [42], for functional autonomy and physical performance assessment;
  • Mini Nutritional Assessment (MNA) [43], for nutritional assessment;
  • Cumulative Illness Rating Scale (CIRS) [44], for medical and psychic impairment’s assessment.
The abovementioned tests were administered by trained geriatricians in an outpatient setting.

4. Statistical Analysis

The quantitative variables were expressed as median and interquartile ranges (IQR). A Mann–Whitney test was used to compare the continuous variables; a chi-squared test (χ²) was used to compare the qualitative variables. Multivariate analysis was performed with a logistic regression—stepwise (p-values > 0.1 were excluded by the model): in order to apply it, the Hb levels were dichotomized such that 1 indicated the presence of anemia. A Kruskal–Wallis’ test was used to perform the analysis of variance; a Conover test was performed for post hoc analysis. The results are reported indicating p-values in reference to the 95% confidence intervals (C.I.).
MedCalc software (Version 19.5, Ostend, Belgium) was used for the statistical analysis.

5. Results

The study included 1698 subjects aged 65 years or more (median age: 80; ranged from 65 to 100), of whom 1194 (70.3%) were women. The characteristics of the enrolled subjects are shown in Table 1 and Table 2.
From the gender comparison of the population under examination, men achieved significantly better performances than women from a cognitive-affective, functional, and nutritional point of view (MMSE, p = 0.0028; CDT, GDS, BADL, PPT, POMA, MNA, p < 0.0001). They also showed a higher school education and higher Hb levels (p < 0.0001) (Table 3).
The population was divided into two groups based on the presence of anemia—according to the WHO criteria (men, Hb < 13 g/dL; women, Hb < 12 g/dL):
  • Anemic group, consisting of 642 patients (37.8% of the sample), of whom 222 males (44% of male population) and 420 females (35.2% of female population);
  • Non-anemic group, consisting of 1056 patients (62.2%), of whom 282 males (56%) and 774 females (64.8%).
Table 4 shows the differences between the groups, highlighting that the non-anemic group achieved significantly better performances than the anemic group in BADL (p < 0.0001), IADL (p = 0.0007), PPT (p = 0.0278), POMA (p = 0.0235), MNA, CIRS TOT, CIRS ICC, and CIRS ISC (p < 0.0001); furthermore, this group was found to be younger (p < 0.0001). No difference emerged in the cognitive-affective domain (MMSE, CDT, GDS), nor in BMI.
In order to measure the prevalence of anemia in the two genders, the chi-squared test revealed a higher prevalence of anemia in men (p = 0.0006) according to the WHO definition, while the prevalence of anemia was higher in women extending the <12 g/dL and <13 g/dL Hb’s cut-off levels to both males and females (p < 0.0001) (Table 5). By applying these Hb’s cut-off levels to the whole study population, we obtained two “new” anemic groups, called: group 1 (Hb < 12 g/dL), consisting of 540 patients (31.8% of the sample), of whom 120 were males (23.8% of male population) and, obviously, 420 females (35.2% of female population), and group 2 (Hb < 13 g/dL), consisting of 979 patients (57.6%), of whom, obviously, 222 were males (44%) and 757 females (63.4%). It goes without saying that we also obtained two “new” non-anemic groups (group 3—Hb ≥ 12 g/dL -, and group 4—Hb ≥ 13 g/dL). From the performed comparison between the new anemic groups and the new non-anemic groups, it emerged that the anemic patients continued to present a more advanced age, a lower level of education, a worse mood, functional and nutritional status, and greater comorbidities both in group 1 vs. group 3 (age, p < 0.0001; education, p = 0.0012; GDS, p = 0.0029; BADL, p < 0.0001; IADL, p = 0.0104; PPT, p = 0.0173; POMA, p = 0.0036; MNA, CIRS TOT, CIRS ISC, and CIRS ICC, p = 0.0001) (Table 6), and in group 2 vs. group 4 (age, p < 0.0001; education, p = 0.0007; GDS, p = 0.0034; BADL, p < 0.0001; IADL, p = 0.0075; PPT, p = 0.0004; POMA, p = 0.0038; MNA, CIRS TOT, CIRS ISC, and CIRS ICC, p = 0.0001) (Table 7).
A logistic regression was then used to measure the independent association between the abovementioned variables and Hb levels. A first regression (R1) was applied by using the <12 g/dL cut-off level (Table 8); a second regression (R2) was applied by using the <13 g/dL cut-off level (Table 9). By R1, it emerged that age [Odds Ratio (OR): 1.03, p = 0.0072], CIRS TOT (OR: 1.08, p < 0.0001), and gender (OR: 0.57, p = 0.0007) were significant regressors of anemia, while the other CGA variables were excluded by the model (p > 0.01) [Area Under the Curve (AUC): 0.626, 95% Confidence Interval (C.I.): 0.595–0.656, standard error: 0.0183]; by R2, it emerged that age (OR: 1.04, p = 0.0001), POMA (OR: 1.03, p = 0.0172), MNA (OR = 0.95, p = 0.0036), CIRS TOT (OR: 1.17, p < 0.0001), CIRS ICC (OR = 0.83, p = 0.018), and gender (OR = 0.48, p < 0.0001) were significant regressors of anemia, while the other CGA variables were excluded by the model (p > 0.01) (AUC: 0.657, 95% C.I.: 0.626–0.686, standard error: 0.0177).
Since age was a significant regressor of Hb, we divided the population in four quartiles according to this variable (Table 10): the median Hb’s levels were 13, 12.7, 12.4, and 12.4 g/dL for first (65–75 years), second (76–80 years), third (81–85 years), and fourth (>85 years) quartiles, respectively. The Conover test (p < 0.000001) demonstrated that people in the first quartile had a higher Hb than the second, third, and fourth; the second quartile was higher than the third and fourth, while the third and fourth quartiles did not show significant differences.

6. Discussion

Anemia is the most common hematological disorder in the elderly [8], reaching a prevalence of approximately 17% in people over 65 years of age [11]. The prevalence of anemia is further increased in individuals over 85 years of age [11]. The causes of anemia in the elderly are various and often more than one contributes to its genesis. Anemia has been associated with increased comorbidity (including neurological and psychiatric disorders), worsening physical performance, quality of life, and increased frequency and duration of hospital admissions [45,46,47,48,49,50]. Despite its clinical importance, anemia in the elderly is poorly recognized and the evidence-based guidelines for its management are lacking. Part of the problem is attributable to the definition that is based on WHO criteria established in 1968 since, although most physicians accept this definition, its applicability to elderly patients is questionable [36].
The aim of our study was to evaluate the impact of anemia on cognitive performances, mood, functional and nutritional status, and comorbidities in a population of subjects aged 65 years or older. Secondly, we studied the prevalence of anemia in our population according to the WHO criteria and extending 12 and 13 g/dL Hb’s cut-off levels to the entire population.
Of the 1698 subjects enrolled in this study, 37.8% (642) were anemic according to the WHO criteria, 31.8% (540) considering Hb < 12 g/dL, and 57% (979) considering Hb < 13 g/dL. In the literature, the prevalence of anemia (assessed through the WHO definition) shows a wide variability, ranging from 8% to 25% [11]. The higher prevalence observed in our study could be related to the peculiarity of the service outpatient as it is dedicated to the frail elderly. About etiologies, only a little part of the sample showed a single possible cause of anemia, according to the literature [8].
In our study, the prevalence of anemia was higher in the male gender (44% vs. 35.2%) if the anemia is defined according to the WHO criteria: these findings are consistent with the literature [11]. Nevertheless, a reversal trend was observed—with a higher prevalence in the female gender—both considering Hb < 12 g/dL (35.2% vs. 23.8%) and <13 g/dL (63.4% vs. 44%) cut-off levels.
Regarding gender, men with anemia presented a better cognitive-affective, functional, and nutritional status than women; these observations are comparable in the gender comparison considering the other Hb’s cut-off levels. The gender comparison—by using all three cut-off levels—in non-anemic subjects showed that men had a better cognitive-affective, functional, and nutritional status than women. As expected [45,46], from our data, it emerged that anemic patients showed a more advanced age, a greater deflection of mood, less functional capacities, malnutrition, and more severe comorbidities. On the contrary, however, we did not observe a greater cognitive impairment in anemic patients, in agreement to some evidence [47]. These aspects were similarly evident according the three cut-off levels, even according to the WHO criteria (but in this case the mood did not show significant differences).
By studying the independent association between Hb levels and the abovementioned domains, we found that, by considering the <12 g/dL cut-off level, age, comorbidities, and gender were independently associated with anemia, while, by considering the <13 g/dL cut-off level, also worse functional capacities (POMA) and nutritional status were independently associated with anemia.
About age, we found that Hb levels decrease when increasing age, but over the 80 years the difference smooths out, probably owing to the mounting burden affecting very-old people (as showed by CIRS, independently associated with anemia).
We can therefore assert that hemoglobin concentrations at the lower limits of normal (according to the WHO criteria) have a general negative impact on mood, functional capacity, malnutrition, and comorbidities, but since a worsening of the affective-functional-nutritional status and the comorbidities emerged in subjects with anemia compared to the counterparts without anemia already with Hb < 13 g/dL for both genders, it would be possible to consider this cut-off to identify anemia in the elderly.

7. Conclusions

In conclusion, anemia in the elderly, albeit minor, should not be considered as a paraphysiological process of aging, but as an expression of pathology and, as such, worthy of adequate clinical evaluation and treatment. Often, multiple causes contribute to the genesis of anemia in the elderly, justifying the standardization of diagnostic algorithms designed for this category of patients [8]; however, the cut-off levels for anemia defined by the WHO should be redefined for geriatric age. It should be desirable to pay specific attention to hematological statuses in the elderly, since our results showed that anemia negatively impacts different geriatric domains. Moreover, we found that a single cause rarely determines anemia. The raised aspects may lead the physicians to holistically examine the patients, since only a comprehensive and early assessment can sustain the appropriate intervention. First, the causes of anemia, often multiple, have to be recognized and, if possible, fixed. Then, personalized intervention in terms of cognitive, affective, and functional status must be performed.
The present study also highlighted that hemoglobin concentrations < 13 g/dL, regardless of gender, have an association with the impairment of the affective-functional-nutritional state as well as an increase in comorbidities; therefore, it should be productive to consider the elderly person with Hb < 13 g/dL “anemic” regardless of gender, although the recent evidence seems to suggest using other cut-off levels [12,35]. Further studies are necessary to confirm the validity of this hypothesis, relating to hemoglobin levels, clinical outcomes, and pathophysiological aspects in the elderly.

Author Contributions

Conceptualization, A.M.; Methodology, A.M. and F.S.; Formal Analysis, G.L.; Investigation, G.L. and B.M.; Data Curation, G.L. and F.S.; Writing—Original Draft Preparation, G.L.; Writing—Review and Editing, F.S. and A.M.; Supervision, A.M. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Institutional Review Board (or Ethics Committee) of the University of Cagliari (protocol code NP/2022/1382, 30 March 2022).

Informed Consent Statement

Informed consent was obtained from all the subjects involved in the study.

Data Availability Statement

The data and materials used and/or analyzed during the current study are not publicly available. The are available from the corresponding author upon reasonable request.

Acknowledgments

Francesco and Antonella want to dedicate this work to the memory of the dear Giambeppe Locci, brilliant doctor, researcher, and, above all, close friend, who recently passed away. Thank you for having given us the chance to share beautiful moments with you.

Conflicts of Interest

The authors have no conflict of interest to declare.

Abbreviations

BMI: Body Mass Index; Comprehensive Geriatric Assessment (CGA), MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; POMA: PPT: Physical Performance Test; Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.

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Table
Table 1. Characteristics of the sample.
Table 1. Characteristics of the sample.
Study Population: n.1698
VariableMedianIQR
Age (years)8075–85
Education (years)53–8
BMI26.723.5–30.5
MMSE21.916.4–25.7
CDT42–7
GDS74–11
BADL765–92
IADL21–5
PPT107–15
POMA149–20
MNA2117.5–23
CIRS TOT.3128–34
CIRS ISC2.22–2.4
CIRS ICC75–8
Hb12.611.6–13.7
IQR: interquartile range; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 2. Hematological Conditions.
Table 2. Hematological Conditions.
Hematological ConditionPercentage
History of leukemia1.5%
Severe Chronic Kidney Disease4%
Iron Deficiency a9.5%
Folate Deficiency b17.1%
Vitamin B12 Deficiency c6.2%
a, data available in 1035 subjects; b, data available in 1022 subjects; c, data available in 1028 subjects.
Table
Table 3. Gender comparison.
Table 3. Gender comparison.
Men
n.504		Women
n.1194		Mann–Whitney
Test
MedianMin–MaxIQRMedianMin–MaxIQRp-Value
Age8065–9674–84.58065–10075–850.0907
Education50–235–850–213–5<0.0001
MMSE230–3017–2621.50–3016–250.0028
CDT50–93–830–92–6<0.0001
GDS50–153–880–155–11<0.0001
BADL831–10063–96.5740–10055–90<0.0001
IADL20–81–520–81–50.3486
PPT110–277–1790–286–14<0.0001
POMA160–2811–22130–289–19<0.0001
MNA21.252–2918–24.520.52–3017.5–23<0.0001
BMI26.4515–5123.5–2926.915–4823.5–310.0412
CIRS TOT.3215–4528–35315–4528–340.0573
CIRS ISC2.231–32–2.52,211–32–2.40.0577
CIRS ICC70–125–871–135–80.3524
Min: minimum; Max: maximum; IQR: interquartile range; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; POMA: PPT: Physical Performance Test; Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 4. Anemic group vs. non-anemic group (WHO criteria).
Table 4. Anemic group vs. non-anemic group (WHO criteria).
Anemic Group
n. 642		Non-Anemic Group
n. 1056		Mann–Whitney
Test
MedianMin-MaxIQRMedianMin-MaxIQRp-Value
Age8165–9677–867965–10074–84<0.0001
Education50–193–850–233–80.0587
MMSE21.70–3016–26220–3017–260.2722
CDT30–93–840–92–70.2627
GDS70–153–870–154–110.2487
BADL730–10063–96.5781–10059–94<0.0001
IADL20–81–530–81–50.0007
PPT90–277–17100–287–150.0278
POMA140–2811–22140–2810–210.0235
MNA206–28.518–24.521.252–3018–23.5<0.0001
BMI26.6715–4623.5–2926.915–5124–310.2612
CIRS TOT.3215–4528–353116–4327–34<0.0001
CIRS ISC2.291–32–2.52.151–32–2.3<0.0001
CIRS ICC70–135–861–125–8<0.0001
Min: minimum; Max: maximum; IQR: interquartile range; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 5. Prevalence of anemia according to different cut-off levels.
Table 5. Prevalence of anemia according to different cut-off levels.
MenWomenχ2 (p-Value)
WHO Criteria222 (44%)420 (35.2%)0.0006
Cut-off Hb < 12 g/dL120 (23.8%)420 (35.2%)<0.0001
Cut-off Hb < 13 g/dL222 (44%)757 (63.4%)<0.0001
WHO: World Health Organization; Hb: hemoglobin; χ2: chi-squared test.
Table
Table 6. Anemic group vs. non-anemic group (cut-off: Hb < 12 g/dL).
Table 6. Anemic group vs. non-anemic group (cut-off: Hb < 12 g/dL).
Group 1 (Hb < 12 g/dL)
n. 540		Group 3 (Hb ≥ 12 g/dL)
n. 1158		Mann–Whitney
Test
MedianIQRMedianIQRp-Value
Age8277–867974–84<0.0001
Education53–6,553–80.0012
MMSE21.415.65–25.72216.7–25.70.0692
CDT32–742–70.0863
GDS85–1173.5–110.0029
BADL7354–887859–94<0.0001
IADL21–421–50.0104
PPT96–14107–150.0173
POMA139–191410–210.0036
MNA19.7517–22.52118–23.5<0.0001
BMI26.623.44–30.5126.923.63–30.610.3676
CIRS TOT.3229–353128–34<0.0001
CIRS ISC2.292.07–2.52.191.93–2.38<0.0001
CIRS ICC75–865–8<0.0001
IQR: interquartile range; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 7. Anemic group vs. non-anemic group (cut-off: Hb < 13 g/dL).
Table 7. Anemic group vs. non-anemic group (cut-off: Hb < 13 g/dL).
Group 2 (Hb < 13 g/dL)
n. 979		Group 4 (Hb ≥ 13 g/dL)
n. 719		Mann–Whitney
Test
MedianIQRMedianIQRp-Value
Age8176–867974–83<0.0001
Education53–754–80.0007
MMSE21.716.2–25.722.3516.7–25.70.2832
CDT32–742–70.1429
GDS84–1173–110.0034
BADL7355–908161–95<0.0001
IADL21–531–50.0075
PPT96–14117–160.0004
POMA149–191510–220.0038
MNA2017–22.521.518.5–24<0.0001
BMI26.6723.44–30.4927.0323.8–30.710.2231
CIRS TOT.3229–353027–33<0.0001
CIRS ISC2.292–2.462.141.93–2.36<0.0001
CIRS ICC75–865–8<0.0001
IQR: interquartile range; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 8. Logistic regression stepwise Hb < 12 g/dL.
Table 8. Logistic regression stepwise Hb < 12 g/dL.
Variable *CoefficientStd. ErrorOR95% C.I.p-Value
Age0.0280.011.031.01–1.050.0072
CIRS TOT0.0780.0161.081.05–1.11<0.0001
Gender−0.5530.1620.570.42–0.790.0007
* MMSE, CDT, GDS, BADL, IADL, PPT, POMA, MNA, CIRS ICC, CIRS ISC, BMI, and education were excluded by the model (p > 0.01) OR: odds ratio; C.I.: Confidence Interval; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 9. Logistic regression stepwise Hb < 13 g/dL.
Table 9. Logistic regression stepwise Hb < 13 g/dL.
Variable *CoefficientStd. ErrorOR95% C.I.p-Value
Age0.0420.011.041.02–1.060.0001
POMA0.0290.0121.031.005–1.0540.0172
MNA−0.0550.0180.950 91–0.980.0036
CIRS TOT0.1540.0371.171.08–1.25<0.0001
CIRS ICC−0.1850.0740.830.72–0.960.0128
Gender−0.7260.1520.480.36–0.65<0.0001
* MMSE, CDT, GDS, BADL, IADL, PPT, CIRS ISC, BMI, and education were excluded by the model (p > 0.01) OR: odds ratio; C.I.: Confidence Interval; BMI: Body Mass Index; MMSE: Mini Mental State Examination; CDT: Clock Drawing Test; GDS: Geriatric Depression Scale; BADL: Basic Activities of Daily Living; IADL: Instrumental Activities of Daily Living; PPT: Physical Performance Test; POMA: Performance Oriented Mobility Assessment; MNA: Mini Nutritional Assessment; CIRS: Cumulative Illness Rating Scale; CIRS ICC: Comorbidity Index Score; CIRS ISC: Severity Index; CIRS TOT.: Total score; Hb: hemoglobin.
Table
Table 10. Kruskal–Wallis and Conover Test.
Table 10. Kruskal–Wallis and Conover Test.
QuartileMedianAverage RankDifferent From
1 (65–75 years)13958.832, 3, and 4
2 (76–80 years)12.7869.561, 3, and 4
3 (81–85 years)12.4796.631 and 2
4 (>85 years)12.4750.591 and 2
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Salis, F.; Locci, G.; Mura, B.; Mandas, A. Anemia in Elderly Patients—The Impact of Hemoglobin Cut-Off Levels on Geriatric Domains. Diagnostics 2023, 13, 191. https://doi.org/10.3390/diagnostics13020191

AMA Style

Salis F, Locci G, Mura B, Mandas A. Anemia in Elderly Patients—The Impact of Hemoglobin Cut-Off Levels on Geriatric Domains. Diagnostics. 2023; 13(2):191. https://doi.org/10.3390/diagnostics13020191

Chicago/Turabian Style

Salis, Francesco, Giambeppe Locci, Barbara Mura, and Antonella Mandas. 2023. "Anemia in Elderly Patients—The Impact of Hemoglobin Cut-Off Levels on Geriatric Domains" Diagnostics 13, no. 2: 191. https://doi.org/10.3390/diagnostics13020191

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