Sample records for frequency eigen
from WorldWideScience.org

Sample records 1 - 3 shown.



1

Características psicométricas de la Escala Center for Epidemiological Studies-depression (CES-D), versiones de 20 y 10 reactivos, en mujeres de una zona rural mexicana/ Psychometric characteristics of the Center for Epidemiological Studies-depression Scale (CES-D), 20-and 10-item versions, in women from a Mexican rural area

Bojorquez Chapela, Ietza; Salgado de Snyder, Nelly
2009-08-01

Resumen en español Los síntomas depresivos son un problema de salud mental frecuente e importante en cuanto a sus consecuencias personales y sociales, que afecta no solamente a la población urbana de los países más desarrollados, sino también a los habitantes de zonas rurales en los países pobres. Para obtener información confiable acerca de la frecuencia de síntomas depresivos, así como de sus factores de riesgo o el éxito de las medidas preventivas y de atención, es necesario c (mas) ontar con instrumentos de medición confiables y válidos. El instrumento Center for Epidemiological Studies - Depression (CES- D), de Radloff, fue desarrollado originalmente para el estudio de síntomas depresivos en población abierta. Si bien no es útil para evaluar la presencia de trastornos depresivos del estado de ánimo tal como son definidos en la nosología psiquiátrica, este instrumento permite estudiar la de un rango de manifestaciones basadas en dimensiones de la depresión consideradas en la bibliografía clínica. El objetivo principal de este estudio fue evaluar las propiedades psicométricas del CESD en mujeres de una zona rural de alta marginación, tanto en su versión original como en la versión de 1 0 reactivos de Andresen et al. La información para este estudio se recabó en la zona mixteca, en tres municipios rurales en los cuales se llevó a cabo un muestreo por conglomerados de localidades y sistemático de hogares. Se aplicó el CES-D a 468 mujeres de entre 1 5 y 49 años en los hogares seleccionados. Se hizo un análisis descriptivo de los resultados de puntuación en cada reactivo, así como de los de la escala completa. Para evaluar la consistencia interna del CES-D en sus versiones de 10 y 20 preguntas, se calcularon las correlaciones entre reactivos, y de cada reactivo con la puntuación en la escala completa, así como el coeficiente de alfa de Cronbach. Se llevó a cabo un análisis factorial con el fin de determinar si la agrupación de los reactivos correspondía a sus dimensiones teóricas. Otra medida de la validez de constructo consistió en analizar la relación entre la puntuación en el CES-D y los resultados en preguntas acerca de los >, un padecimiento reconocido en la tradición étnica de la región. Se observó también la asociación con la presencia de enfermedades crónicas y con el nivel educativo, dos variables que han mostrado estar asociadas a los síntomas depresivos. Para evaluar la capacidad del CES-D-10 de medir los síntomas depresivos, en comparación con la versión de 20 reactivos, se calculó el coeficiente de correlación de Spearman entre las puntuaciones en ambas escalas. Se calculó también el estadístico kappa para evaluar la concordancia entre las versiones larga y corta en la clasificación de individuos por encima del punto de corte. El valor de alfa de Cronbach del CES-D-20 fue de 0.84 y el del CES-D-1 0 de 0.74. Para el CES-D-20, se extrajeron cuatro factores con valores propios mayores a 1, que explicaron en conjunto 50.6% de la varianza. El gráfico de sedimentación mostró que una solución en dos factores también hubiera sido adecuada. Para el CES-D-1 0, se extrajeron dos factores que explicaron en conjunto 46.5% de la varianza. La correlación de Spearman entre el CES-D-20 y el CES-D-10 fue de 0.94 (p Resumen en inglés Depressive symptoms constitute a common mental health problem, with a relevant social and personal impact. These symptoms are present not only among the urban population in more economically developed countries, but also in rural areas in poor and middle development countries. In order to obtain reliable information on the frequency of depressive symptoms, their risk factors or the impact of preventive and clinical measures, valid measurement instruments are needed. Radlo (mas) ff's Center for Epidemiological Studies - Depression scale (CES-D) was originally developed for the study of depressive symptoms in an open population. While the CES-D is not useful for the evaluation of depressive disorders according to psychiatric criteria, it can still yield useful information about the presence of depressed mood, feelings of guilt and worthlessness, feelings of helplessness and hopelessness, psychomotor retardation, and somatic complaints, which constitute dimensions of depression. The instrument has been shown to be valid in culturally diverse groups. It has also been shown to correlate with the clinical diagnosis of depression, with sensibility as high as 100%, while its specificity has been reported as 57-88%. Shorter versions of the CES-D have been developed. Their advantages include a more easy inclusion in ample questionnaires, and their being less tiresome for respondents. The main objective of this study was to evaluate the psychometric properties of CES-D, both the original, 20- item version, and the 10-item version by Andresen et al., in women living in the Mixteca, a poor rural area which includes part of the states of Guerrero, Oaxaca and Puebla, in southern Mexico. The instrument was applied as part of a comprehensive survey on health and migration in three rural municipalities in the Mixteca. The sampling design included cluster, proportional to size sampling of localities, and systematic selection of households. At each household, one woman of between 15 and 49 years of age responded a questionnaire which included the CES-D. A total of 468 women were included in the sample (median 35 years, interquartile range 28, 42). Of these, 89% were married or had a stable partner, 5% were single, 13% separated, and 12% widowed. The majority (65%) had only six years of schooling, while 1 6% had no formal education. The statistical analysis was conducted on the 343 questionnaires with complete answers to the CES-D (73% of the sample). The mean score in CES-D-20 was 11.3 (standard deviation 8.8). The mean score in CES-D-10 was 6.3 (standard deviation 5.0). According to the respective cut-off points, prevalence of depressive symptoms was 24.5% for the CES-D-20 and 22.3% for CES-D-1 0. A descriptive statistical analysis of the scores in each item and in the complete scales was conducted. In order to evaluate the internal consistency of CES-D, both 1 0- and 20- item versions, inter-item and item-total correlations were calculated. Cronbach's alpha coefficient was also obtained. Factor analysis was employed to determine if the actual aggregation of the items was coherent with the theoretical dimensions they were intended to measure. Another way to prove validity was through the analysis of the association between the score in the CES-D and the answers to questions about >, an ethnical syndrome well recognized in the region and sharing characteristics with depression. Also, the association of scores with other variables known to be related to depressive symptoms, such as being chronically ill or the educational level, was investigated. In order to evaluate CES-D-10 capacity to identify depressive symptoms, taking the CES-D-20 as reference, Spearman's correlation coefficient between the scores in both scales was calculated. The kappa statistic was employed to evaluate the concordance between scales in the classification of individuals according to their respective cut-off points. For CES-D-20, Cronbach's alpha value was 0.84 and for CES-D-10 it was 0.74. For CES-D-20, four factors with eigen values over 1 were extracted, accounting for 50.6% of variance. The first one included items which, according to Radloff's original solution, are part of the dimensions depressed affect, retarded activity, and positive affect. The second one included items from the depressed affect, retarded activity, and interpersonal dimensions. The fourth factor included only two items, both from the positive affect dimension. A scree plot showed that a two factor solution could also be adequate. For CES-D-10, two factors were extracted, accounting for 46.5% of variance. As for convergent validity, women who reported having > had a median CES-D-20 score of 13.5 (IQR 8.8, 22), while those who did not report the illness had a median score of 9 (IQR 4, 14). Women without a formal education had a median CES-D-20 score of 1 2 (IQR 8, 20), those who had completed elementary school had a median score of 10 (IQR 5, 15), and those with junior high or over had a median of 8 (IQR 3, 15). Those who reported having a chronic illness had a median score of 12 (IQR 8, 18), while those without a chronic illness had a median of 8 (IQR 4, 13). Similar results were observed for the CES-D-10. Spearman's correlation coefficient between CES-D-20 and CES-D-10 was 0.94 (p

Scientific Electronic Library Online (Spanish)

2

Estructura de pérdidas en la adultez mayor: una propuesta de medida/ Loss structure in elderly adults: A measurement proposal

Rivera-Ledesma, Armando; Montero-López Lena, María
2008-12-01

Resumen en español La estructura de pérdidas puede ser definida como el conjunto de objetos significativos (susceptibles de ser agrupados en diferentes clases de pérdidas), percibidos bajo amenaza de ser perdidos, efectivamente perdidos, o cuya pertenencia es insegura o ambigua (concebibles como tipos de pérdidas), en una etapa determinada de la vida, y cuya influencia define cogniciones, afectos y conductas ante ella. La estructura de pérdidas presente en la adultez mayor, sin preceden (mas) te en la vida del sujeto, podría definir diferentes rutas de desajuste. La Escala de Estructura de Pérdidas (EEP) propuesta aquí, es un instrumento cuyo propósito es permitir la exploración de las pérdidas que suelen ocurrir en la adultez mayor. La EEP permite la exploración sistemática de un abanico de pérdidas previamente validadas en un contexto latinoamericano, mexicano, como una primera aproximación a las posibles causas psicosociales del desajuste psicológico en la adultez mayor. La EEP propuesta aquí, obtuvo una estructura factorial compuesta de nueve factores bien definidos que en conjunto incluyeron 36 reactivos, con una consistencia interna alfa de .91 que explicó 67.4% de la varianza. La consistencia interna de los nueve factores fluctuó entre valores alfa de .74 y .83. Además, se obtuvieron correlaciones moderadamente altas entre el total del puntaje de la EEP con todas las variables de desajuste psicológico (entre r = .50 y r = .66; p Resumen en inglés The term > in this article refers to the lack of a significant adaptive resource that is a central part of the affective world of the subject. The absence of such resource can generate psychological distress. Old age is seen as a time in which numerous changes occur that are associated with losses in important areas of life and which, as a whole, constitute a major source of stress. These losses involve a series of physical, social and psychological changes that af (mas) fect and define old age and that require the subject to develop a process of adaptation to many intense stressors. Loss structure can be defined as a set of significant objects (that can be grouped under different loss categories), perceived as being under threat of being lost, effectively lost, or whose existence is uncertain or ambiguous (conceived of as types of loss), and whose influence continues to define cognitions, affection and behaviors. The unprecedented loss structure found in elderly adults could set up different routes of maladjustment. Maladjustment appear in three fundamental areas: psychological, physical and social. Hence, frustration can lead to depression. Successive losses seen as a series of failures can generate feelings of despair; losses related to sources of affection can produce loneliness, etc. The Loss Structure Scale (LSS), proposed here is an instrument for exploring losses that usually occur in old age. It also allows a systematic exploration of a wide range of losses previously validated in the Mexican context as a first approach to possible psychosocial causes of psychological maladjustment in old age. Method The project was divided into two phases. The first corresponded to the design of the LSS, and the second to a psychometric evaluation. Four samples were used with subjects chosen by availability in Mexico City. One model of the scale was explored that consisted of 60 items linked to experiences of loss with three reply options for each item: No loss, Ambiguous loss, and Definite loss in a final sample of 193 subjects (69.34% women, N = 134). The following instruments were used: The Center of Epidemiological Studies Depression Scale; Beck's Anxiety Inventory; Hunter Opinions and Personal Expectations Scale; the perceived disease subscale of WHOQoL- Brief; The World Health Organization Quality of Life Assessment, Brief; the Lack of Emotional Wellbeing subscale of the Multifaceted Loneliness Inventory and the Anxiety About Aging Scale. Results Factor structure. A factor analysis was carried out using the principal components method with varimax rotation and eigen values greater than one. The final factor structure showed nine well defined factors covering 36 items with an internal alpha consistence of .91 explaining 67.4% of the variance. Alpha values for the internal consistence of the 9 factors fluctuated between .74 and .83. Construct validity. 1) Moderately high correlations were obtained between total score on the Loss Structure Scale and all psychological maladjustment variables (between r=.50 and r = .66; p

Scientific Electronic Library Online (Spanish)