Psychometric validation of the AOSL scale using confirmatory factor analysis: A nationally representative sample

BACKGROUND

The opioid overdose epidemic has worsened during the COVID-19 pandemic. Recent data revealed a 28.5% increase in drug-related overdose deaths from 2019 to 2020. Adolescents often misuse family members' and friends' prescription opioid medications. Furthermore, adolescents may not possess the knowledge or understanding to safely manage opioid medications. There is a need for a validated scale to effectively measure adolescents' opioid misuse knowledge, attitudes, and interest in learning about prescription opioid safety.

OBJECTIVE

The purpose of this study was to validate the Adolescent Opioid Safety and Learning (AOSL) scale with a nationally representative sample of adolescents and confirm the factor structure of the scale using confirmatory factor analysis (CFA).

METHODS

Adolescent participants (aged 13-18 years) completed the 16-item AOSL scale in Qualtrics from November to December 2020. A total of 774 responses were analyzed. A CFA was performed to determine the fit of the data to the 4-factor model proposed by a prior exploratory factor analysis of the AOSL scale. Fit was assessed using the chi-square test, comparative fit index (CFI), Tucker-Lewis index (TLI), and root mean-squared error of approximation (RMSEA).

RESULTS

Participants were 50% male and 62% white non-Hispanic. The CFI was 0.984, TLI was 0.980, and RMSEA was 0.048 ([95% CI 0.041-0.054], P-value that RMSEA ≤ 0.05 = 0.712). The chi-square test results were χ2 = 268.752 on 98 degrees of freedom (P < 0.001). Cronbach's alpha, a measure of internal consistency, was high within each factor. CFA indicated good fit of the current study's data to the 4-factor model.

CONCLUSION

We found the AOSL scale measures adolescents' knowledge of opioid misuse, knowledge of opioid harm, interest in learning about prescription opioids, and likelihood to practice misuse behaviors. This scale can help researchers understand adolescent perceptions and opinions about opioid safety.

Psychometric properties of a French version of the Jefferson Scale of Empathy

OBJECTIVE

To assess the reliability and construct validity of a French version of the Jefferson Scale of Empathy-Students.

METHODS

A cross-sectional study was performed among undergraduate medical students in Tunisia. A total of 833 students completed a French version of the JSE-S using convenience sampling. To identify the internal consistency aspect of the reliability, Cronbach's alpha coefficient was computed. Moreover, to assess the construct validity, the sample was randomly divided into two groups. Data from the first group (n=415) were subjected to exploratory factor analysis (EFA), with principal axing factoring (PAF) and oblimin rotation, to re-examine the underlying factor structure of the scale. Data from the second group (n=419) were used for confirmatory factor analysis (CFA) to confirm its latent variable structure. Some goodness-of-fit indices were used to assess the hypothesized model. Gender groups were compared using a t-test to check the known-group validity.

RESULTS

Reliability analysis reported an acceptable level of internal consistency, with an overall Cronbach's alpha of 0.78 (95% CI [0.75,0.80]). EFA identified a two-factor structure, accounting for 27.4% of the total variance. The two-factor model produced good fit indices when item correlated errors were considered (χ²/df = 1.95, GFI = 0.92, CFI = 0.90, PCFI = 0.79, PGFI = 0.73 and RMSEA = 0.04). Female students had a statistically significant higher empathy scores than male students (t ₍₈₃₀₎ = - 4.16, p < .001).

CONCLUSIONS

The findings support the construct validity and reliability of a French version of the JSE for medical students. This instrument appears to be useful for investigating empathy among French-speaking populations.

Subscale structure for the Positive and Negative Syndrome Scale (PANSS): a proposed solution focused on clinical validity

Although the items of the Positive and Negative Syndrome Scale (PANSS) are ordinal, continuous data methods are consistently used to analyze them. The current study addresses this issue by applying a categorical method and critically examining the ideas of item inclusion and goodness of fit. Data from 1527 subjects were used to test a proposed solution to the factor structure of the PANSS using a categorical factor analytic method. The model was made more generalizable by setting a minimum level of association between the item and the factor, and the results were then compared to existing solutions. The model was also tested for consistency in a first-episode sample. Use of categorical methods indicated similar results to previous analyses; however, it is demonstrated that the strength of the estimates can be unstable when items are shared across factors. The current study demonstrates that solutions can change substantially when a model is over-fitted, and therefore use of measures of fit as the criterion for an acceptable model can mask important relationships and decrease clinical validity.

GHQ increases among Scottish 15 year olds 1987-2006

BACKGROUND

Increases in a number of psychosocial disorders have been identified among Western youth in the second half of the Twentieth century. However findings are not consistent, trends are complex, and comparisons over time are hampered by methodological problems.

METHODS

Data were drawn from three samples identical in respect of age (15 years), school year (final year of statutory schooling) and geographical location (the West of Scotland). Each sample was administered the 12-item General Health Questionnaire, a measure of self-report psychological distress, in 1987 (N = 505), 1999 (N = 2,196) and 2006 (N = 3,194). Analyses were conducted to examine changes in: GHQ 'caseness'; individual items; and factors, derived via confirmatory factor analysis representing (a) 'negative' and 'positive' items, and (b) 'anxiety and depression', 'loss of confidence or self-esteem' and 'anhedonia and social dysfunction'.

RESULTS

Based on the standard (2/3) cut-off, 'caseness' rates in 1987, 1999 and 2006 were 12.7, 15.1 and 21.5% (males) and 18.8, 32.5 and 44.1% (females). Similar increases were observed with more stringent 'caseness' cut-offs. Examination of individual items showed some to have increased much more markedly over time than others. There were larger increases among females for all except two items and some evidence, among both genders, of steeper increases among 'negative' items compared with 'positive' ones. However, the differences in slope were very small compared with the overall increases in both types.

CONCLUSIONS

Data from three samples identical in respect of age, school year and geographical location, show marked increases in GHQ-12 'caseness' among females between 1987 and 1999 and among both males and females between 1999 and 2006. Although slightly steeper increases in 'negative' items raise the possibility that endorsing such symptoms may have become more acceptable, these were small in comparison with increases in all dimensions of psychological distress. The next step is to identify causal explanations for the increases reported here.