Cronbach's α reliability, concurrent validity, and factorial structure of the Death Depression Scale in an Iranian hospital staff sample

Risk Management of Island Petrochemical Park: Accident Early Warning Model Based on Artificial Neural Network

Island-type petrochemical parks have gradually become the ‘trend’ in establishing new parks because of the security advantages brought by their unique geographical locations. However, due to the frequent occurrence of natural disasters and difficulties in rescue in island-type parks, an early warning model is urgently needed to provide a basis for risk management. Previous research on early warning models of island-type parks seldom considered the particularity. In this study, the early warning indicator system is used as the input parameter to construct the early warning model of an island-type petrochemical park based on the back propagation (BP) neural network, and an actual island-type petrochemical park was used as a case to illustrate the model. Firstly, the safety influencing factors were screened by designing questionnaires and then an early warning indicator system was established. Secondly, particle swarm optimization (PSO) was introduced into the improved BP neural network to optimize the initial weights and thresholds of the neural network. A total of 30 groups of petrochemical park data were taken as samples—26 groups as training samples and 4 groups as test samples. Moreover, the safety status of the petrochemical park was set as the output parameter of the neural network. The comparative analysis shows that the optimized neural network is far superior to the unoptimized neural network in evaluation indicators. Finally, the Zhejiang Petrochemical Co., Ltd., park was used as a case to verify the accuracy of the proposed early warning model. Ultimately, the final output result was 0.8324, which indicates that the safety status of the case park was “safer”. The results show that the BP neural network introduced with PSO can effectively realize early warning, which is an effective model to realize the safety early warning of island-type petrochemical parks.

Strategies for Constructing College Students' Entrepreneurial Value Judgments Based on Educational Psychology

Against the background of economic globalization, the strategies for constructing college students' entrepreneurial value judgment are explored, providing college graduates with more employment options and thereby keeping up with the trend of the times. The documentary analysis and questionnaire survey methods are adopted to investigate contemporary college students' entrepreneurial value judgments, and the investigation results are organized. According to documentary materials, the discovered problems are analyzed to put forward strategies for constructing college students' entrepreneurial value judgments based on educational psychology. Results show that only 14.1% of college graduates choose to start a business; 48.7% do not understand or recognize the entrepreneurial values; 14.8% believe teaching activities on constructing entrepreneurial value judgments are insufficient, and the entrepreneurial atmosphere is lacking. Regarding the above investigation results, strategies for constructing college students' entrepreneurial value judgments are proposed, involving the construction environment, construction system, construction method, and construction mechanism. Hence, considering contemporary college students' entrepreneurial values, the proposed strategies for constructing college students' entrepreneurial judgments are suitable and valuable, providing a practical reference for enriching and perfecting the college innovation and entrepreneurship education systems.

Death depression in Egyptian clinical and non-clinical groups

Aim

The main aims of this study were to explore the differences between seven Egyptian clinical and non-clinical samples in death depression, as well as to estimate gender-related differences.

Design

A cross-sectional study.

Methods

The Death Depression Scale (DDS) was administered to seven groups (N = 765) of Egyptian normal (non-clinical) patients, anxiety outpatients, schizophrenic inpatients (men and women) and addicts (men only) in individual sessions.

Results

Anxiety outpatients of both sexes obtained significantly and greatly higher death depression scores than did the other five groups, whereas the male schizophrenics, the male addicts, and the male and female non-clinical groups had the lowest death depression scores. Female schizophrenics obtained a significantly higher death depression scores than did male schizophrenics, addicts and non-clinical participants. Female anxiety outpatients and schizophrenics had higher death depression mean scores than did their male counterparts.

Discussion

The present finding is consistent, in general, with previous studies on death anxiety and death obsession. What applied to death anxiety was consistent also with death depression and death obsession. That is, the death distress concept.

Predictive factors associated with death depression in women with breast cancer

A cross-sectional study with a convenience sample of 241 patients with breast cancer was conducted to investigate death depression and its explanatory factors in Iranian women who were diagnosed and undergoing treatment for breast cancer. Patients with significantly higher death depression were those who were housewives (β = 0.6, p = 0.016), unskilled workers (β = 15.8, p = 0.002), and retired (β = 13.1, p = 0.002) as compared with those who were professionally employed with higher socio-economic status (β = 17.4, p = 0.002); and those receiving combination therapy as compared to surgery only (β = 6.3, p = 0.02). For patients with higher spiritual health scores, death depression was significantly lower (β = -0.2, p < 0.001).

Death distress constructs: A preliminary empirical examination of the Farsi form in nurses: A brief note

Aim

Death distress can increase mental health problems. The aim of the present study was to develop a measure of death distress and evaluate the reliability of this Death Distress Scale-Farsi (DDS-F) among nurses. The hypotheses were that death distress has three components and that the DDS-F would have desirable psychometric properties.

Design

A descriptive cross-sectional study.

Methods

A convenience sample of 106 Iranian nurses from two hospitals at Tehran city, Iran was recruited. They completed the Death Anxiety Scale (DAS), the Death Depression Scale (DDS) and the Death Obsession Scale (DOS).

Results

Cronbach's α for the DDS-F was 0.71. As expected, the DDS-F had three independent components: death obsession, death depression and death anxiety. A principle component analysis with a varimax rotation of the DDS-F items identified three factors accounting for 66.13% of the variance. Factor 1 was labelled "Death Obsession" (31.3% of the variance), Factor 2 was labelled "Death Depression" (21.9% of the variance), and Factor 3 was labelled "Death Anxiety" (12.8% of the variance).

Discussion

Death distress has three components: death obsession, death depression and death anxiety. The DDS-F which measures these has good psychometric properties, and it can be used in hospital settings to assess death distress among Iranian nurses.

Transcultural adaptation and psychometric properties of Chinese version of Death Depression Scale-Revised among nursing students

The study aimed to determine the psychometric properties of the Chinese version of the Death Depression Scale in a sample of 391 nursing students. The Cronbach's alpha coefficient was 0.91, ranging from 0.65 to 0.91 for each subscale. Test-retest reliability was satisfactory (r = 0.821). Overall content validity index was 0.83. An exploratory factor analysis yielded 5 factors: anergia and anhedonia, death sadness, other death, death emptiness, and death vacuum. The model had an acceptable fit, with all factors loading greater than 0.5. Results provide preliminary support for the reliability and validity of the measure in nursing student populations.

The effectiveness of 8A model death education on the reduction of death depression: A preliminary study

Aim

Death education using the 8A model can reduce death distress and promote mental health. The aim of the present study was to investigate the effectiveness of the 8A model death education programme for reducing death depression among nurses. The hypothesis was that participating in the 8A model death education programme would reduce death depression.

Design

A pre-test-post-test intervention.

Methods

Ten nurses were selected randomly from the intensive care units and critical care units wards of the Khatom-Al-Anbia General Hospital in Tehran, Iran. They completed the Death Depression Scale before and after intervention. The 8A model was conducted in six workshops weekly, each of 6 hr, for a total of 36 hr.

Results

There was a significant difference between pre-test and post-test on the Death Depression Scale scores.

Discussion

The 8A model appears to be useful for the reduction of death depression and the promotion of mental health in the sample. However, the model should be tested on larger samples and with a control group before concluding that the model is effective in reducing death distress.

The Psychometric Parameters of the Farsi Form of the Arabic Scale of Death Anxiety

The aim of this study was to describe the psychometric properties of the Farsi Form of the Arabic Scale of Death Anxiety (ASDA). The original scale was first translated into Farsi by language experts using the back translation procedure and then administered to a total of 252 Iranian college students and 52 psychiatric outpatients from psychiatric and psychological clinics. The one-week test-retest reliability of the Farsi version in a sample of college students was 0.78, indicating good temporal stability and corroborating the trait-like nature of scores. Cronbach's α was 0.90 for the college students and 0.92 for the psychiatric outpatients, indicating high internal consistency. Scale scores correlated 0.46 with Death Obsession Scale scores, 0.56 with Death Depression Scale scores, 0.41 with Death Anxiety Scale scores, and 0.40 with Wish to be Dead Scale scores, indicating good construct and criterion-related validity. A principal component analysis with a Varimax rotation yielded four factors in the sample of Iranian college students, indicating a lack of homogeneity in the content of the scale. Male students obtained a significant higher mean score than did females. It was concluded that the Farsi ASDA had good internal consistency, temporal stability, criterion-related validity, and a factor structure reflecting important features of death anxiety. In general, the Farsi ASDA could be recommended for use in research on death anxiety among Iranian college students and psychiatric outpatients.