Validation of the Prodromal Questionnaire–Brief in a representative sample of adolescents: Internal structure, norms, reliability, and links with psychopathology

Fonseca‐Pedrero, Eduardo; Inchausti, Félix; Pérez‐Albéniz, Alicia; Ortuño‐Sierra, Javier

doi:10.1002/mpr.1740

Cited by 35 publications

(23 citation statements)

References 63 publications

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“…These results differed from a previous study by Fonseca-Pedrero et al ( 28 ), where PQ-B item endorsement showed strong measurement invariance across gender among community adolescents. Nevertheless, they simultaneously report large gender effects for items 7 and 20 in a separate differential item functioning (DIF) analysis, and we thus replicated their results for item 7, despite a different age group and language version.…”

Section: Discussioncontrasting

confidence: 99%

“…Thus, the assessment of measurement invariance is especially critical across groups that have been found to differ in the trait of interest. Among studies addressing PLEs questionnaires, measurement invariance has been demonstrated across gender ( 27 , 28 ), an encouraging result which warrants replication. When extending the concept of PLEs to include schizotypy, results have been mixed with regards to ethnicity ( 29 – 32 ), and the non-invariance between ethnic groups may wholly or in part be explained by language version differences ( 31 ).…”

Section: Introductionmentioning

confidence: 83%

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Measurement Invariance of Psychotic-Like Symptoms as Measured With the Prodromal Questionnaire, Brief Version (PQ-B) in Adolescent and Adult Population Samples

et al. 2021

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Valid measurement of group differences in self-reported psychotic-like experiences (PLEs) requires knowing any group-specific measurement properties of the instruments. We investigated the measurement invariance of the 21-item Prodromal Questionnaire–Brief (PQ-B) questionnaire across gender, ethnic minority/majority status, and presence of depressive symptoms in two different US non-clinical undergraduate samples (N = 1,099). For each item, endorsement of the experience and the associated distress were combined for analysis. A unidimensional model of the PQ-B fit the data well. Across genders, the PQ-B showed configural and metric, but not full scalar invariance; there were statistically significant differences in eight thresholds of six items, most being higher endorsement thresholds for self-identified females. Partial scalar invariance was also found for ethnic status, with five thresholds of three items being higher for the minority participants. For depressive symptomatology, defined as the top quintile by the Beck Depression Inventory–II, partial scalar invariance required dropping one item, after which there were statistically significant differences only in two response thresholds. Overall, a wide range of PLE questionnaire items were found to be robust to gender and ethnicity effects, strengthening confidence in found group differences in PLEs. Although full scalar invariance could not be ascertained for any of the group comparisons, the few found scalar differences across groups were small, with minimal impact on group PLE estimates. However, since PLEs are easily conceptually entangled with depression symptoms, similar items should be considered for exclusion if separable constructs are the target of investigation.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 83%

Measurement Invariance of Psychotic-Like Symptoms as Measured With the Prodromal Questionnaire, Brief Version (PQ-B) in Adolescent and Adult Population Samples

et al. 2021

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“…As the participants recruited in this study were college students with an age range of 14 to 31 years, while NAPLS recruited clinician-referred subjects aged 12 to 35 years, SHARP included helpseeking subjects aged 15 to 45 years, and RAP included help-seeking subjects aged 12 to 22 years. Similar to previous studies using PQ-B to screen CHR in Chinese population [16,22,[45][46][47], our research proved that PQ-B could be a feasible rst-step instrument for screening suspected CHR subjects in college students. Both the sensitivity and speci city of PQ-B were excellent in this study.…”

Section: Discussionsupporting

confidence: 85%

Screening of the College Students at Clinical High Risk for Psychosis in China: A Multicenter Epidemiological Study

Long

Liu

et al. 2020

Preprint

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Background: To investigate a 3-stage screening procedure and explore the clinical features of subjects at Clinical High Risk (CHR) for psychosis in a representative sample of Chinese college students. Methods: An epidemiological survey of the prevalence of CHR syndrome in Chinese college students that was selected by stratified random sampling from Shanghai, Nanjing and Nanchang cities was done followed a 3-stage procedure. Participants was initially screened with the Prodromal Questionnaire-brief version (PQ-B), and whose distress score of PQ-B exceeded 24 would be invited to a telephone assessment using the subscale for positive symptoms of the Scale of Prodromal Symptoms (SOPS)/Structured Interview for Prodromal Syndromes (SIPS). Lastly, participants who scored 3 or higher in any item of the subscale would be administered with the SIPS interview conducted by trained researchers to confirm the diagnosis of CHR syndrome. Results: 23 063 college students completed the survey during September 2017 to October 2018. 72 students were diagnosed as CHR subjects, and the detection rate in the total sample was 0.3%. The peak age range for the first diagnosis of CHR was 17 to 20 years. 13 and 46 were set as the cut-off points of PQ-B total score and distress score to balance the greatest sensitivity and specificity. Binary logistic regression revealed that 8 items in PQ-B showed significant distinction for detecting CHR subjects. Conclusions: The 3-stage screening method can be utilized in the detection of CHR subjects for psychosis in general population, during which delusional ideas, perceptual abnormalities and suspiciousness deserve great attention.

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“…Similar to previous studies using PQ-B to screen CHR in Chinese population [16,22,[45][46][47], our research proved that PQ-B could be a feasible rst-step tool to detect suspected CHR subjects in college students.…”

Section: Discussionsupporting

confidence: 85%

Screening of the College Students at Clinical High Risk for Psychosis in China: A Multicenter Epidemiological Study

Long

Liu

et al. 2020

Preprint

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Background: To investigate a 3-stage screening procedure and explore the clinical features of subjects at Clinical High Risk (CHR) for psychosis in a representative sample of Chinese college students. Methods: An epidemiological survey of the prevalence of the CHR syndrome in Chinese college students that was selected by stratified random sampling from Shanghai, Nanjing and Nanchang cities was done following a 3-stage procedure. Participants were initially screened with the Prodromal Questionnaire-brief version (PQ-B), and whose distress score of PQ-B exceeded 24 would be invited to a telephone assessment using the subscale for positive symptoms of the Scale of Prodromal Symptoms (SOPS)/Structured Interview for Prodromal Syndromes (SIPS). Lastly, participants who scored 3 or higher in any item of the subscale would be administered with the SIPS interview conducted by trained researchers to confirm the diagnosis of CHR syndrome. Results: 23 063 college students completed the survey during September 2017 to October 2018. 72 students were diagnosed as CHR subjects, and the detection rate in the total sample was 0.3%. The peak age range for the first diagnosis of CHR was 17 to 20 years. 13 and 46 were set as the cutoff points of PQ-B total score and distress score to balance the greatest sensitivity and specificity. Binary logistic regression revealed that 8 items in PQ-B showed significant distinction for detecting CHR subjects. Conclusions: The 3-stage screening method can be utilized in the detection of CHR subjects for psychosis in the general population, during which delusional ideas, perceptual abnormalities and suspiciousness deserve great attention.

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Validation of the Prodromal Questionnaire–Brief in a representative sample of adolescents: Internal structure, norms, reliability, and links with psychopathology

Cited by 35 publications

References 63 publications

Measurement Invariance of Psychotic-Like Symptoms as Measured With the Prodromal Questionnaire, Brief Version (PQ-B) in Adolescent and Adult Population Samples

Measurement Invariance of Psychotic-Like Symptoms as Measured With the Prodromal Questionnaire, Brief Version (PQ-B) in Adolescent and Adult Population Samples

Screening of the College Students at Clinical High Risk for Psychosis in China: A Multicenter Epidemiological Study

Screening of the College Students at Clinical High Risk for Psychosis in China: A Multicenter Epidemiological Study

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