The Impact of Aging, Cognition, and Symptoms on Functional Competence in Individuals With Schizophrenia Across the Lifespan
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1 Schizophrenia Bulletin doi: /schbul/sbu114 Schizophrenia Bulletin Advance Access published August 6, 2014 The Impact of Aging, Cognition, and Symptoms on Functional Competence in Individuals With Schizophrenia Across the Lifespan Sawsan M. Kalache 1,2, Benoit H. Mulsant 1,2, Simon J. C. Davies 1,2, Angela Y. Liu 1,2, Aristotle N. Voineskos 1,2, Meryl A. Butters 3, Dielle Miranda 1, Mahesh Menon 1,2, Robert S. Kern 4, and Tarek K. Rajji*,1,2 1 Division of Geriatric Psychiatry, Centre for Addiction and Mental Health, Toronto, Canada; 2 Department of Psychiatry, University of Toronto, Toronto, Canada; 3 Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA; 4 Department of Psychiatry and Department of Veterans Affairs VISN 22 MIRECC, University of California, Los Angeles, CA *To whom correspondence should be addressed; Centre for Addiction and Mental Health, 80 Workman Way, 6th Floor, Room 6312, Toronto, ON M6J1H4, Canada; tel: ext , fax: , Tarek.Rajji@camh.ca Objective: Life expectancy in individuals with schizophrenia continues to increase. It is not clear whether cognitive deficits associated with schizophrenia remain as strong predictors of function in older and younger individuals. Thus, we assessed the relationship between cognition and functional competence in individuals with schizophrenia across 7 decades of life. Methods: We analyzed data obtained in 232 community-dwelling participants with schizophrenia (age range: years). Cognition was assessed using the Measurement and Treatment Research to Improve Cognition in Schizophrenia Consensus Cognitive Battery. Functional competence was assessed using the UCSD Performance-based Skills Assessment, which includes measures of Comprehension and Planning of Recreational Activities Skills, Financial Skills, Communication Skills, Transportation Skills, and Household Management Skills. To assess the effects of Global Cognition on functional competence, we performed hierarchical multivariate linear or logistic regression analyses controlling for age, education, gender, and negative symptoms. Results: Participants mean age was 49.1 (SD = 13.2, range = years), 161 (69%) were male, and 55 (24%) were aged 60. Global Cognition was a predictor of Comprehension and Planning Skills (Exp(β) = 1.048), Financial Skills (Exp(β) = 1.104), Communication Skills (ΔR 2 =.31) and Transportation Skills (Exp(β) = 1.066), but not Household Management Skills after adjusting for age, education, gender, and negative symptoms of schizophrenia. Conclusion: Cognition remains a strong predictor of functional competence across the lifespan. These findings suggest that treating cognitive impairment associated with schizophrenia could improve individuals function independent of their age. Key words: aging/cognition/functional competence/ lifespan/schizophrenia Introduction Schizophrenia is one of the most disabling mental illnesses 1,2 : the Global Burden of Disease study lists schizophrenia as the eighth leading cause of disability. 3 Disability associated with schizophrenia is due to functional impairments that span multiple domains including independent living, 4 8 social functioning, 9 11 and vocational abilities. 5,12 As such, these impairments have a tremendous personal and economic impact Functional abilities are also affected by the normal aging process. 16 For example, older healthy individuals are slower in completing instrumental activities of daily life. 17 Thus, as the population of individuals with schizophrenia grows older, understanding the interactions between schizophrenia and aging on functional abilities could provide an opportunity to better design age-sensitive interventions for remediation of functional impairments. Among young and middle-aged individuals with schizophrenia, cognitive deficits are consistently among the strongest predictors of functional outcomes Cognitive deficits associated with schizophrenia persist into late life and seem to progress at similar rates as those observed among older healthy individuals. 27,28 However, it is not known whether the cognitive deficits associated with schizophrenia impact functional abilities independent of aging and, to the same extent, across the lifespan. Real-world functioning is determined not only by schizophrenia or aging-related factors, but also by environmental factors. 29 Hence, assessing functional competence in a laboratory setting allows for understanding the impact of the illness and aging on function without the confounding effect of the environment. 6,30 34 Currently, no studies have assessed the relationship between cognition and functional competence in patients with schizophrenia across the lifespan. The Author Published by Oxford University Press on behalf of the Maryland Psychiatric Research Center. All rights reserved. For permissions, please journals.permissions@oup.com Page 1 of 8
2 S. M. Kalache et al Several publications reported significant correlations between cognition and functional competence in older individuals with schizophrenia. 4,6,24,25,32,35 40 Some of these publications 4,6,25,35 38 included individuals older than 40 years with a mean age in the 50s rather than late-life samples. Other publications focused on individuals older than 50 years. 30,32,39,40 However, these latter publications could not assess the relationship between cognition and function across the lifespan because of a narrow age range. One publication 30 included a wide age range of individuals with schizophrenia (27 87 years); however, they did not assess the effect of aging on the relationship between cognition and function. To address this gap in the literature, we analyzed the relationship between cognition and function in participants aged years with comparable numbers of individuals aged <40, 40 49, 50 59, and 60 years. We used the University of San Diego Performance-Based Skills Assessment (UPSA) 6 to assess functional competence and a comprehensive neuropsychological assessment using the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) Consensus Cognitive Battery (MCCB). 41,42 Our primary hypothesis was that cognition would be a predictor of functional competence across the lifespan even after controlling for age. We also explored whether the relationship between cognition and function changes in strength across the lifespan. Methods Participants Our data were obtained in 59 participants at the Centre for Addiction and Mental Health (CAMH) in Toronto, Canada, 28 and 173 participants during the MATRICS Psychometric and Standardization Study (MATRICS PASS). 43 These 232 community-dwelling participants ages ranged from 19 to 79 years. The numbers of participants were: 51, aged <40 years; 56, aged years; 70, aged years; and 55 aged 60 years. Eligibility criteria for the CAMH participants were (1) age 50 years; (2) meeting Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) TR criteria for a current diagnosis of schizophrenia or schizoaffective disorder; (3) clinically stable as operationalized by (a) not having been hospitalized within 3 months and (b) having had no change in antipsychotic medication dosage within 4 weeks prior to assessment; (4) ability and willingness to speak English; (5) corrected hearing and visual acuity; (6) ability and willingness to provide written informed consent; (7) not meeting criteria for a cognitive disorder secondary to a neurological disease or brain injury; (8) Mini-Mental State Examination (MMSE) 44 score of 18 years because individuals with very low MMSE scores are unlikely to be able to complete a neuropsychological battery such as the MCCB; (9) Page 2 of 8 not having a current major depressive or manic episode; (10) no alcohol or other substance abuse within the past 6 months; and (11) no electroconvulsive therapy within 6 months prior to assessment. 28 Eligibility criteria for the MATRICS PASS participants were comparable to those for CAMH participants except for age: MATRICS PASS included individuals aged years. 43 All participants signed a written informed consent approved by the local ethics board. Measures Clinical Symptoms. We confirmed the diagnosis with the Structured Clinical Interview for DSM-IV Disorders. 45 We assessed the severity of clinical symptoms with the Positive And Negative Syndrome Scale (PANSS) 46 in CAMH participants and with the Brief Psychiatric Rating Scale Extended Version (BPRS-E) 47 in MATRICS PASS participants. Given that negative symptoms are strong predictors of function in individuals with schizophrenia, 48,49 we included a negative symptoms score based on the negative symptoms shared by the PANSS and BPRS-E (ie, blunted affect, uncooperativeness, emotional withdrawal, motor retardation, and disorientation). Cognition. We assessed cognitive performance with the MCCB. The MCCB consists of 10 neuropsychological tests that assess 7 cognitive domains: Attention/ Vigilance (Continuous Performance Test-Identical Pairs); Speed of processing (Digit-Symbol-Coding, Category Fluency Test, Trail Making Test Part A); Social cognition (Mayer-Salovey-Caruso Emotional Intelligence Test: Managing Emotions); Working memory (Visual Memory Spatial Span, Letter-Number Span); Verbal learning (Hopkins Verbal Learning Test-Revised); Visual learning (Brief Visuospatial Memory Test-Revised); and Reasoning and problem solving (Mazes). The MCCB was developed to capture change in separate cognitive domains in clinical trials of cognitive enhancement in schizophrenia In this analysis, we generated a composite T-score of Global Cognition by weighing the 7 cognitive domains equally (mean = 50, SD = 10). To do so, we standardized each cognitive test based on a sample of 333 community-dwelling age and sex-matched healthy individuals. 28 Then, we standardized the sums of the T-scores for the tests comprising each cognitive domain. These 333 healthy individuals were recruited at CAMH or in MATRICS PASS at the same time as the recruitment of the participants with schizophrenia. At CAMH, Master s level psychometrists administered the MCCB supervised by a senior neuropsychologist (M.A.B.). Function. We assessed participants functional competence with the UPSA. 6,50 The UPSA is a functional competence measure that was developed specifically to assess
3 Cognition, Aging, and Function in Schizophrenia functional competence in individuals with schizophrenia. It assesses competence to comprehend and plan recreational activities, manage finances, communicate, use public transportation, and manage household chores. At CAMH, a research nurse administered the UPSA, supervised by one of the investigators (T.K.R.). Data Analysis. First, we performed descriptive analyses and reported on the demographic, clinical, cognitive, and functional variables. We checked the functional measures (Comprehension and Planning of Recreational Activities Skills, Financial Skills, Communication Skills, Transportation Skills, and Household Management Skills) for normality of distribution. If the data were not found to be normally distributed, we performed a binary classification of the outcome variables using the median as the cut-off score. Second, we performed univariate linear or logistic regression analyses between Global Cognition and each functional measure. Third, to assess the impact of Global Cognition on functional competence after controlling for other predictors, we performed multivariate linear or logistic regression analyses that included, in addition to Global Cognition, age or age + age 2 where the best-fitted model was quadratic, education, gender, and negative symptoms scores. Finally, we centered the variables of age and Global Cognition and included the interaction term age Global Cognition or (age + age 2 ) Global Cognition in the multivariate regression analyses, to assess whether age moderates the relationship between cognition and function. We conducted all analyses using SPSS Version Results Demographic, Clinical, Cognitive, and Functional Characteristics Table 1 shows demographic, clinical, cognitive, and functional characteristics of participants from CAMH and MATRICS PASS. Figure 1 illustrates the relationships between Global Cognition (T-scores) and each of the 5 functional measures of the UPSA within each of the 4 age groups: <40, 40 49, 50 59, 60 years. Relationship Between Global Cognition and Functional Measures Data on Comprehension and Planning of Recreational Activities Skills, Financial Skills, Transportation Skills, and Household Management Skills were not normally distributed. Thus, we performed a binary classification as described in what follows. Data on Comprehension and Planning of Recreational Activities Skills were skewed, with a median score of 11 out of 14. We chose a score of 12 (48.3%) to indicate low impairment, and a score of 11 (51.7%) to indicate high impairment. Univariate logistic regression analysis Table 1. Demographic, Clinical, Cognitive and Functional Characteristics Total 10.6 (2.9) Number of participants (N) 232 Age (years) Range Mean (SD) 49.1 (13.2) Female, N (%) 71 (31%) Years of education, mean (SD) 12 (3) Ethnicity, N (%) 148 (64%) Caucasian African Descent 57 (25%) Hispanic/Latino 11 (5%) Asian or Pacific Islander 8 (3%) Native American/Canadian or Alaskan 1 (<1%) Other 7 (3%) Negative symptoms score, mean (SD) 8.34 (3.12) Global Cognition (MCCB) a, mean T-score (SD) 30.9 (11.9) UPSA functional domains scores (range of score) mean (SD) Communication (0 9) 6.6 (2.0) Finances (0 11) 9.8 (1.6) Comprehension and Planning of Recreational Activities (0 14) b Transportation (0 6) 5.2 (1.3) Household chores (0 4) 3.3 (0.9) Note: MATRICS PASS, Measurement and Treatment Research to Improve Cognition in Schizophrenia Psychometric and Standardization Study; UPSA, University of California San Diego Performance-Based Skills Assessment. a Composite score of the MATRICS Consensus Cognitive Battery. b Only the data from the second role-play scenario (trip to the zoo) was used in this analysis as it was the only one administered in MATRICS PASS. revealed that Global Cognition alone is a significant predictor of Comprehension and Planning of Recreational Activities Skills (β =.063, SE = 0.013, Wald = , df = 1, p <.001, Exp(β) = 1.065). After adding age + age 2, education, gender, and negative symptoms score as independent variables in a multivariate logistic regression analysis, Global Cognition remained a significant predictor of Comprehension and Planning (β =.047, SE = 0.015, Wald = 9.378, df = 1, p =.002, Exp(β) = 1.048). Education (β =.154, SE = 0.064, Wald = 5.827, df = 1, p =.016, Exp(β) = 1.166) and gender (β =.820, SE = 0.344, Wald = 5.681, df = 1, p =.017, Exp(β) = 0.440) were significant predictors whereas negative symptoms did not contribute significantly to variation in Comprehension and Planning of Recreational Activities Skills. The variable age + age 2 was a significant predictor of this functional measure; however, its effect size was almost null (β <.001, SE < 0.001, Wald = 9.161, df = 1, p =.002, Exp(β) = 1.000). The inclusion of the interaction term (age + age 2 ) Global Cognition in this regression analysis did not contribute significantly to variation in Comprehension and Planning of Recreational Activities Skills. Data on Financial Skills were negatively skewed, with a median score of 11 out of 11. We chose a score of 11 Page 3 of 8
4 S. M. Kalache et al Fig. 1. Relationships between Global Cognition and Functional Measures. This figure illustrates that irrespective of age, individuals with schizophrenia with low impairments in Comprehension and Planning of Recreational Activities Skills, Financial Skills, Communication Skills, and Transportation Skills have higher performance in Global Cognition. This relationship is comparable across the 4 age groups. In contrast, individuals with low impairments in Household Management Skills do not have higher Global Cognition when compared with those who are highly impaired (see the main text for statistical analyses). Circles in the box plots figures refer to outliers. (51.1%) to indicate low impairment and a score of 10 (48.9%) to indicate high impairment. Univariate logistic regression analysis revealed that Global Cognition alone is a predictor of Financial Skills (β =.111, SE = 0.017, Wald = , df = 1, p <.001, Exp(β) = 1.117). After adding age + age 2, education, gender, and negative Page 4 of 8
5 Cognition, Aging, and Function in Schizophrenia symptoms score, Global Cognition remained a significant predictor of Financial Skills (β =.095, SE = 0.019, Wald = , df = 1, p <.001, Exp(β) = 1.100). Age + age 2 (β =.001, SE < 0.001, Wald = , df = 1, p <.001, Exp(β) = 0.999) was also a significant predictor. Education, gender, and negative symptoms did not contribute significantly to variation in Financial Skills. The inclusion of the interaction term (age + age 2 ) Global Cognition in this regression analysis did not contribute significantly to variation in Financial Skills. Data on Communication Skills were normally distributed. Univariate linear regression analysis revealed that Global Cognition was a significant predictor of Communication Skills (R =.561, Adjusted R 2 =.311, β =.093, SE = 0.009, standardized β =.561, t = , p <.001). After adding age + age 2, education, gender, and negative symptoms score as independent variables in a multivariate linear regression analysis, Global Cognition remained a significant predictor of Communication Skills (R =.561, R 2 =.314, β =.089, SE = 0.011, standardized β =.535, t = 8.076, p <.001). Age + age 2, education, gender, and negative symptoms did not contribute significantly to variation in Communication Skills. The inclusion of the interaction term (age + age 2 ) Global Cognition did not contribute significantly to variation in Communication Skills. Data on Transportation Skills were skewed, with a median score of 6 out of 6. We chose a score of 6 (58%) to indicate low impairment, and a score of 5 (42%) to indicate high impairment. Global Cognition alone was a significant predictor of Transportation Skills (β =.090, SE = 0.015, Wald = , df = 1, p <.001, Exp(β) = 1.095). After adding age + age 2, education, gender and negative symptoms score, Global Cognition (β =.064, SE = 0.018, Wald = , df = 1, p <.001, Exp(β) = 1.066), age + age 2 (β =.001, SE < 0.001, Wald = , df = 1, p <.001, Exp(β) = 0.999), education (β =.133, SE = 0.068, Wald = 3.848, df = 1, p =.05, Exp(β) = 1.143), and gender (β =.802, SE = 0.381, Wald = 4.437, df = 1, p =.035, Exp(β) =.448) contributed significantly to variation in Transportation Skills, whereas negative symptoms did not. The inclusion of the interaction term (age + age 2 ) Global Cognition in this regression analysis did not contribute significantly to variation in Transportation Skills. Data on Household Management Skills were skewed, with a median score of 3 out of 4. We chose a score of 4 (48.3%) to indicate low impairment, and a score of 3 (51.7%) to indicate high impairment. Global Cognition alone was a significant predictor of Household Management Skills (β =.026, SE = 0.012, Wald = 4.921, df = 1, p =.027, Exp(β) = 1.026). After adding age, education, gender, and negative symptoms score, age remained the only variable to contribute significantly to variation in Household Management Skills (β =.024, SE = 0.012, Wald = 3.891, df = 1, p =.049, Exp(β) = 0.976). The inclusion of the interaction term age Global Cognition in this regression analysis did not contribute significantly to variation in Household Management Skills. Discussion To our knowledge, this is the first study that used a lifespan approach to examine the relationship between cognition and functional competence in schizophrenia. In our sample of 232 individuals with schizophrenia, aged years, Global Cognition as assessed using the composite score of the MCCB was a strong predictor of functional competence after controlling for age on measures of Comprehension and Planning of Recreational Activities Skills, Financial Skills, Communication Skills, and Transportation Skills, but not Household Management Skills. Across the lifespan and after controlling for age, the strength of the relationship between cognition and function varied between small and large effect sizes depending on the functional domain. Cognition accounted for 31% of variance in communication skills, constituting a large effect size. However, effects sizes were small in the other functional domains: Financial Skills, Comprehension and Planning of Recreational Activities Skills, and Transportation Skills. The sizes of these effects are comparable to what other studies have found among adult and midlife individuals with schizophrenia. 21 For example, in a sample of 96 individuals with schizophrenia with a mean age ~40 years, cognition accounted for 28% of variance in total functional competence (total score of UPSA). 31 Thus, cognition predicts functional competence in individuals with schizophrenia regardless of age and to a magnitude similar to the magnitude in studies of younger and middle-aged individuals. This is further confirmed by the fact that in our study there was no interaction between age and cognition in the prediction of functional competence. These results suggest that the strength of the relationship between cognition and function does not vary with age. Focusing on late life, our results suggest that for a 70-year old male individual with schizophrenia with 12 years of formal education performing at 2 SDs below average on global cognition, improving his cognition by 1 SD will result in enhancing his performance on Financial and Transportation Skills to the levels of a male individual in early 60s. Improving his cognition by 1 SD will result in enhancing his performance on Communication and Comprehension and Planning of Recreational Activities by 6 10%. Several other studies that assessed the relationship between cognition and functional competence in middleage and older individuals with schizophrenia found an effect of cognition on function. 4,6,25,32,35 40 However, they did not assess for an aging effect due to narrow age ranges. In contrast, the lifespan approach and the wide age range in our study allowed us to demonstrate, for the first time, Page 5 of 8
6 S. M. Kalache et al the impact of cognition on functional competence independent of aging effect, as well as the impact of aging on the relationship between cognition and function. Our findings suggest that improving cognition in individuals with schizophrenia is likely to improve function at any age, including late in life. Although our study found significant associations between cognition and function, the strengths of these associations were moderate. Several factors can explain these moderate associations. One is the fact that some of the cognitive abilities needed for the functional tasks assessed by UPSA are not well captured by MCCB. For example, mental arithmetic 52 and visuospatial construction 37 are strongly associated with financial competence but not assessed by MCCB. Future studies using a more extensive neuropsychological battery might show stronger associations between cognition and function. We found a relatively weak aging effect on 4 functional competencies and no effect on the fifth one. This aging effect is consistent with the normal aging effect on these functional competencies. 53 It is possible that the effect of aging on functional competencies could be underestimated because we are assessing competence in a laboratory setting rather than real life and, therefore, may not be capturing the effect of aging through medical and physical morbidities. 54 In contrast, the effect of aging could also be overestimated due to the fact that older individuals with schizophrenia have had more years of inexperience at some of these tasks when compared with younger individuals, rendering them less competent at these tasks than expected. For example, older individuals with schizophrenia might have not written checks (finance) or gone grocery shopping (household chores), or used a map (transportation) for many more years than younger individuals with schizophrenia. We did not find any significant relationship between negative symptoms and function. However, our finding is limited by the assessment tool used for negative symptoms. In addition, other studies that reported on a relationship between negative symptoms and function using a better scale of negative symptoms found a weak relationship. 25 Our study has some further limitations. We assessed participants at various locations and within the contexts of 2 different studies. The participants recruited at CAMH were 50 years and constituted the vast majority of the group of participants 60 years. This design feature limited our ability to control for a site confounding effect because there were almost no older participants from the MATRICS PASS sites and all CAMH participants were older, ie, site and age were highly correlated. The design of our study is cross-sectional. Thus, our findings are limited by cohort and survival effects. This also limits our ability to conclude on a causal relationship between cognition and function. Although interventions that aimed to improve cognition have improved functional competence, 55 we cannot exclude the possibility Page 6 of 8 that improving functional competence may improve cognition. Another limitation is that a recent study found that the MCCB and measures of functional competence (including a brief version of the UPSA) constitute a single latent trait. 56 This recent study questions the extent to which these functional measures are capturing behaviors and phenotypes beyond what the cognitive measures are capturing. Finally, some of the UPSA functional measures are correlated. These correlations range from being small and nonsignificant (eg, between Financial and Household Skills) to 0.48 (between Financial and Transportation Skills). One approach would have been to perform factor analysis using our own sample. However, given that our focus was not on the UPSA scale per se, and we were interested in presenting our results in relationship to how UPSA is being administered with its distinct subscales, we chose to present our results for each individual functional measure. In conclusion, our study is the first to demonstrate a cognitive effect on functional competencies that is independent of aging and that persists across the lifespan. Our results suggest that cognitive enhancement is likely to improve function at all ages among individuals with schizophrenia. Longitudinal studies of cognition and function are needed to characterize the trajectories of these dimensions of the illness especially as the population of individuals with schizophrenia continues to grow older. Funding MATRICS initiative through the National Institute of Mental Health at the National Institutes of Health contract (N01MH22006) to the University of California, Los Angeles; Canadian Institutes of Health Research (CIHR to B.H.M., and CIHR to T.K.R.). Acknowledgments The authors would like to acknowledge all participants and their families for their contribution to this work. Dr Butters has received remuneration for providing neuropsychological assessment services for GlaxoSmithKline and received salary support from NIH R01 MH and MH Dr Kern is an officer with MATRICS Assessment, Inc and he receives financial compensation for his role in the nonprofit organization. The other authors report no conflicts of interest. References 1. Strassnig MCR, Newcomer J, Harvey P. Cognitive deficits, obesity and disability in schizophrenia. Transl Neurosci. 2012;3: Świtaj P, Anczewska M, Chrostek A, et al. 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