Li-Jen Weng

Impact of the Number of Response Categories and Anchor Labels on Coefficient Alpha and Test-Retest Reliability

A total of 1,247 college students participated in this study on the effect of scale format on the reliability of Likert-type rating scales. The number of response categories ranged from 3 to 9. Anchor labels on the scales were provided for each response option or for the end points only. The results indicated that the scales with fewresponse categories tended to result in lower reliability, especially lower test-retest reliability. The scales with all the response options clearly labeled were likely to yield higher test-retest reliability than those with only the end points labeled. Scale design that leads to consistent participant responses as indicated by test-retest reliability should be preferred.

Social participation reduces depressive symptoms among older adults: An 18-year longitudinal analysis in Taiwan

BackgroundRelatively little empirical attention has focused on the association between social participation and depressive symptoms amongst older adults in Asian nations, where persons over the age of 65 represent a rapidly growing segment of the population. This study explores the dynamic relationship between participation in social activities and trajectories of depressive symptomatology among older Taiwanese adults surveyed over 18 years.MethodsData are from a nationally representative sample of 1,388 adults aged 60-64 first surveyed in 1989 and followed over an 18-year time period for a total of six waves. Individual involvement in social activities was categorized into continuous participation, ceased participation before age 70, initiating participation in older adulthood, never participated, and dropped out before age 70. Two domains of depressive symptoms--negative affect and lack of positive affect--were measured using a 10-item version of the Center for Epidemiologic Studies-Depression Scale.ResultsAnalyses using growth curve modeling showed that continuously participating or initiating participation in social activities later life is significantly associated with fewer depressive symptoms among older Taiwanese adults, even after controlling for the confounding effects of aging, individual demographic differences, and health status.ConclusionsThese findings suggest that maintaining or initiating social participation in later life benefits the mental health of older adults. Facilitating social activities among older adults is a promising direction for programs intended to promote mental health and successful aging among older adults in Taiwan.

Psychometric Testing of the Social Support Survey on a Taiwanese Sample

Background: The Medical Outcomes Study Social Support Survey (MOS-SS) is a multidimensional, self-administered instrument used to assess various functional dimensions of social support. Less is known regarding its value for a Chinese population. Objective: The aim of this study was to assess the psychometric properties of the MOS-SS on an adult sample in Taiwan. Methods: A total of 265 adult family caregivers of patients with cancer from four different hospitals in the north, middle, and south regions of Taiwan completed the MOS-SS. Results: In the original five-factor model, unsatisfactory item discriminant validity was found in almost half of the items; the item-own subscale correlation was lower than the item-other subscale correlation. A two-factor model accounting for 68.98% of the variance was found using exploratory factor analysis. The first factor (emotional support) accounted for 62.28% of the total variance, whereas the second factor (tangible support) accounted for 6.7%; the interfactor correlation was .71. The two-factor model seemed to have satisfactory reliability and validity and better discrimination between different subscales than did the original five-factor model. Discussion: Good reliability and validity were demonstrated in the MOS-SS when applied to an adult sample in Taiwan. A two-factor model, instead of a five-factor model as found in the Western countries, was found for this sample. Confirmation of the two-factor model and exploration of the two-factor model in related concepts are suggested for future studies.

Parallel Analysis with Unidimensional Binary Data

The present simulation investigated the performance of parallel analysis for unidimensional binary data. Single-factor models with 8 and 20 indicators were examined, and sample size (50, 100, 200, 500, and 1,000), factor loading (.45, .70, and .90), response ratio on two categories (50/50, 60/40, 70/30, 80/20, and 90/10), and types of correlation coefficients (phi and tetrachoric correlations) were manipulated. The results indicated that parallel analysis performed well in identifying the number of factors. The performance improved as factor loading and sample size increased and as the percentages of responses on two categories became close. Using the 95th and 99th percentiles of the random data eigenvalues as the criteria for comparison in parallel analysis yielded higher correct rate than using mean eigenvalues.

Depression and somatic symptoms scale: a new scale with both depression and somatic symptoms emphasized.

Abstract  The authors’ preliminary study selected 22 items for Depression and Somatic Symptoms Scale (DSSS), including depression subscale (DS) and somatic subscale (SS). The aim of the study was to test reliability and validity of the DSSS. The study enrolled 135 consecutive outpatients (34 male and 101 female) experiencing a major depressive episode (the MDE group), 95 of whom (25 male and 70 female) accepted 1 month of treatment (the treatment group). Diagnosis was confirmed by using the Structured Clinical Interview for 4th edition with text revision Diagnostic and Statistical Manual Axis I Disorders. The DSSS and Hamilton Depression Rating Scale (HAMD) were given and evaluated. Cronbach’s alpha was used to assess internal consistency. The correlation between the improvement percentage (IP) for the HAMD and the IP for the DSSS was calculated for the treatment group. Factor analysis was performed by using the principal‐axis factoring method with promax rotation. Cronbach’s alpha values of the DSSS and its subscales ranged from 0.73 to 0.94. Pearson correlation coefficients for the relationship between the DSSS and HAMD ranged from 0.63 to 0.86. In the treatment group, DSSS and HAMD scores were significantly decreased after treatment and the IP for the HAMD and the DSSS were similar and correlated (correlation coefficient = 0.78). The results of the factor analysis demonstrated that most of the items in DS and SS appropriately loaded in Depression and Somatic factors, respectively. The discriminative ability of the DSSS for anxiety comorbidities was not inferior to that of the HAMD. Therefore, the DSSS is reliable and sensitive to the treatment and has acceptable convergent, factorial, and distinct‐groups validities. Because it assesses both depression and somatic symptoms, DSSS may overcome the deficiency of other depression scales with few somatic items.

EFFECTS OF RESPONSE ORDER ON LIKERT-TYPE SCALES

The study investigated whether the change of response order in a Likert-type scale altered participant responses and scale characteristics. Response order is the order in which options of a Likert-type scale are offered. The sample included 490 college students and 368 junior high school students. Scale means with different response orders were compared. Structural equation modeling was used to test the invariance of interitem correlations, covariances, and factor structure across scale formats and educational levels. The results indicated that response order had no substantial influence on participant responses and scale characteristics. Motivating participants and avoiding ambiguous items may minimize possible effects of scale format on participant responses and scale properties.

Multiple population covariance structure analysis under arbitrary distribution theory

This paper states and proves the asymptotic properties of constrained generalized least squares estimators in the analysis of covariance structures in multiple populations with arbitrary distributions of variables. Asymptotic chi-square tests are also presented to permit evaluation of the goodness-of-fit of models. The currently known results for multiple population models based on variables that are multivariate normally distributed are obtained as a special case.

Do older adults become more depressed with age in Taiwan? The role of social position and birth cohort

Background: Depression is one of the most commonly encountered mental health problems during older adulthood. This study examines differences in depressive symptom trajectories among older Taiwanese adults across two birth cohorts (1920–1924 and 1925–1929), and explores the relationships between socioeconomic position (SEP) variables and symptom trajectories. Methods: Data from the Taiwan Longitudinal Study on Aging (TLSA) collected between 1989 and 2003 were analysed. The nationally representative sample is composed of community-living adults (n = 2458) in Taiwan aged 60 years and above. Two distinct domains of depressive symptomatology, negative affect and lack of positive affect, assessed by the short form of the Center of Epidemiological Studies–Depression (CES-D) scale were used for all the analyses. Growth curve models were employed to assess the trajectories of depressive symptoms over time. Results: The relationship between ageing and depressive symptoms appeared linear with a minor curvilinear effect. The depressive symptoms in negative affect increased with age (mean linear growth rate  = 0.26, p<0.001) but levelled off (mean quadric growth rate  = −0.01, p<0.001), while the symptoms in lack of positive affect displayed an opposite trend. The effects of SEP variables also differed by cohort and outcome domain. Conclusions: Remaining active, living with family and having a high level of education are associated with positive affect later in life, while financial strain and poor health are strongly related to negative affect. These results underline the continued role that SEP plays in psychological adjustment over the course of one’s life, independently of ageing.

Social relations and PTSD symptoms: a prospective study on earthquake-impacted adolescents in Taiwan.

This prospective longitudinal study examined two competing models, a traditional social support model and a supportive and detrimental social relations model, to clarify the association of PTSD symptoms with supportive and detrimental social relations. Seven-hundred five adolescents living near the epicenter of the Taiwan Chi-Chi Earthquake participated in the study. The models were evaluated and cross-validated using structural equation modeling. The supportive and detrimental social relations model appeared to be a better fit. After further evaluation of three nested versions of the supportive and detrimental social relations model, detrimental social relations was found to partially mediate the relationship between PTSD symptoms 1 and 2 years following the earthquake. The findings suggest that helping adolescents deal with detrimental social relations can contribute to postdisaster adjustment.

Economic strain and well-being in late life: findings from an 18-year population-based longitudinal study of older Taiwanese adults

BACKGROUND This study estimates the concurrent and longitudinal effects of perceived economic strain and socioeconomic status (SES) on well-being of older adults in Taiwan. METHODS This study uses data from the Taiwan Longitudinal Study on Aging, a nationally representative sample (n= 3602) of older adults aged 60 and above. Participants were interviewed and followed for 18 years. Individual well-being is measured by self-reported life satisfaction, psychological distress and perceived health status. Generalized linear modeling with the generalized estimating equation estimates is used to predict the relationships between perceived economic strain, SES and well-being cross-sectionally and longitudinally, controlling for individual background characteristics, physical health and survival status. RESULTS Older adults who experienced economic strain had significantly poorer well-being in comparison to older adults without strain, both cross-sectionally and longitudinally, controlling for SES and other covariates. In contrast, SES indicators did not consistently predict well-being in the cross-sectional and longitudinal analyses. CONCLUSIONS These findings suggest a strong, cumulative, negative effect of perceived economic strain on well-being among older adults. Health-care initiatives aiming at promoting well-being among older adults should consider the impact of economic strain, which may increase at the end of the life course and threaten health and functioning.