Investigating the Psychometric Properties of the 8-Item Somatic Symptom Scale in Non-clinical Sample of Iranian People

Goodarzi, Mana; Ahmadi, Seyed Mojtaba; Lighvan, Maryam Asle Zaker; Rahmati, Farima; Molavi, Mohammad-Reza; Mohammadi, Masi

doi:10.32598/jpcp.8.1.59

Cited by 6 publications

(8 citation statements)

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“…PHQ-15 and SSS-8 did not report this reliability measure [16][17][18]. The PSQ-39 questionnaire in the present study showed acceptable internal consistency nearly at the same levels which were observed in the previous works in Iran using other questionnaires [16][17][18].…”

Section: Discussionsupporting

confidence: 65%

“…PSQ-39 showed higher test-retest reliability than SOMS-7 (ICC of 0.86) and other questionnaires assessing somatoform symptoms in the Iranian population i.e. PHQ-15 and SSS-8 did not report this reliability measure [ 16 – 18 ]. The PSQ-39 questionnaire in the present study showed acceptable internal consistency nearly at the same levels which were observed in the previous works in Iran using other questionnaires [ 16 – 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…There are only three Iranian validated questionnaires for assessing psychosomatic symptoms including “Screening for somatic symptom disorders-7 (SOMS-7)”, “Patient health questionnaire (PHQ-15)” and “Somatic Symptom Scale (SSS)”, an abbreviated 8-item version of the PHQ-15 [ 16 – 18 ]. SOMS-7 is a questionnaire with 53 items designed to evaluate the effects of treatment in patients with somatic symptom disorders.…”

Section: Introductionmentioning

confidence: 99%

“…The Persian version of the SOMS-7 has been validated in the general population and it has 47 items and 4 dimensions (pain, cardiovascular and respiratory symptoms), (gastrointestinal and urologic symptoms), (neurological functioning symptoms), (musculoskeletal symptoms) [ 16 ]. The items of PHQ-15 and SSS-8 assess the gastrointestinal problems, headaches, joint pain, dizziness, and difficulty falling asleep and are scored based on a 5-point Likert-type scale [ 17 , 18 ]. The factor structure of both questionnaires reflects gastrointestinal problems, pain, fatigue, and cardiopulmonary domains for somatoform symptoms.…”

Section: Introductionmentioning

confidence: 99%

“…The factor structure of both questionnaires reflects gastrointestinal problems, pain, fatigue, and cardiopulmonary domains for somatoform symptoms. The validation process of the PHQ-15 and SSS-8 was done in patients and university students, respectively not in the general population [ 17 , 18 ]. Of the main limitations of these questionnaires are few items for evaluating the somatoform symptoms, and they assess symptoms during long retrospective periods.…”

Section: Introductionmentioning

confidence: 99%

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Psychosomatic symptoms questionnaire (PSQ-39): a psychometric study among general population of Iranian adults

et al. 2021

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Background Psychosomatic symptoms, characterized by physical-bodily complaints not fully explained by organic reasons, are highly prevalent. The present study aimed to culturally adapt and evaluate the psychometric properties of Psychosomatic Symptoms Questionnaire 39-item version (PSQ-39) among Iranian general adult population. Methods This study included 996 Persian-speaking people, living in Isfahan, Iran. The translation of the PSQ-39 was performed using the forward-backward method. Test-retest reliability was evaluated through Intraclass correlation (ICC) coefficient and internal consistency by using Cronbach’s α. Construct validity was investigated by using both exploratory (EFA) and confirmatory (CFA) factor analysis. Short Form Health Survey (SF-36) was used to assess divergent validity. Known-group validity was also assessed. Results The Persian version of the PSQ-39 showed excellent test-retest reliability in all domains (ICCs: 0.95–0.99). The computed Cronbach’s alpha coefficients for domains of PSQ-39 were in the range good to excellent. The PSQ-39 showed good known-group validity and differentiated patients from the general population (Area under the curve [AUC] of 0.78 (95% CI: 0.73, 0.84). Construct validity evaluated by EFA led to extraction of seven factors (Cardiorespiratory, musculoskeletal, psychological, gastrointestinal, general, body balance and Globus), and the CFA confirmed the adequacy of extracted factors by EFA (CFI = 0.91, TLI = 0.90, PCFI = 0.77, PNFI = 0.71, CMIN = 1413.18 (df = 654), CMIN/DF = 2.16, and RMSEA = 0.06). Significant negative correlations between all domains of PSQ and SF-36 revealed an acceptable divergent Validity. Conclusions The Persian version of the PSQ-39 is a reliable and valid questionnaire with applicability in a broad range of Persian language populations for assessing common psychosomatic symptoms in research as well as in clinical practice.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Psychosomatic symptoms questionnaire (PSQ-39): a psychometric study among general population of Iranian adults

et al. 2021

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Measurement Properties of the Patient Health Questionnaire–15 and Somatic Symptom Scale–8

Hybelius,

Kosic,

Salomonsson

et al. 2024

JAMA Netw Open

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ImportanceThe subjective experience of somatic symptoms is a key concern throughout the health care system. Valid and clinically useful instruments are needed.ObjectiveTo evaluate the measurement properties of 2 widespread patient-reported outcomes: the Patient Health Questionnaire–15 (PHQ-15) and Somatic Symptom Scale–8 (SSS-8).Data SourcesMedline, PsycINFO, and Web of Science were last searched February 1, 2024.Study SelectionEnglish-language studies reporting estimates pertaining to factor analysis, taxometric analysis, internal consistency, construct validity, mean scores in relevant groups, cutoffs, areas under the receiver operating characteristic curves (AUROCs), minimal clinically important difference, test-retest reliability, or sensitivity to change.Data Extraction and SynthesisSearch hits were reviewed by independent raters. Cronbach α, Pearson r, means, and between-group effect sizes indicative of sensitivity to change were pooled in random-effects meta-analysis. Study quality was assessed using 3 instruments. Reporting followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 reporting guideline.Main Outcomes and MeasuresComprehensive overview of evidence pertaining to the measurement properties of the PHQ-15 and SSS-8.ResultsA total of 305 studies with 361 243 participants were included. Most concerned routine care (178 studies) and the general population (27 studies). In factor analyses, both scales reflected a combination of domain-specific factors (cardiopulmonary, fatigue, gastrointestinal, pain) and a general symptom burden factor. The pooled PHQ-15 α was 0.81 (95% CI, 0.80-0.82), but with low item-total correlations for items concerning menstrual problems, fainting spells, and sexual problems (item-total correlations &lt;0.40), and the SSS-8 α was 0.80 (0.77-0.83). Pooled correlations with other measures of somatic symptom burden were 0.71 (95% CI, 0.64-0.78) for the PHQ-15 and 0.82 (95% CI, 0.72-0.92) for the SSS-8. Reported AUROCs for identification of somatoform disorders ranged from 0.63 (95% CI, 0.50-0.76) to 0.79 (95% CI, 0.73-0.85) for the PHQ-15 and from 0.71 (95% CI, 0.66-0.77) to 0.73 (95% CI, 0.69-0.76) for the SSS-8. The minimal clinically important difference on both scales was 3 points. Test-retest reliability could not be pooled and was inconsistent for the PHQ-15 (PHQ-15: r = 0.65-0.93; ICC, 0.87; SSS-8: r = 0.996, ICC = 0.89). The PHQ-15 showed tentative sensitivity to change (g = 0.32; 95% CI, 0.08-0.56), but data for the SSS-8 were lacking.Conclusions and RelevanceIn this systematic review and meta-analysis, findings supported use of the PHQ-15 and SSS-8 for the assessment of symptom burden, but users should be aware of the complex, multifactorial structures of these scales. More evidence is needed concerning longitudinal measurement properties.

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Psychometric evaluation of the somatic symptom scale − 8 in patients with somatic symptom disorder in Iran

Abasi,

Ghapanchi,

Toussaint

et al. 2024

Curr Psychol

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Investigating the Psychometric Properties of the 8-Item Somatic Symptom Scale in Non-clinical Sample of Iranian People

Cited by 6 publications

References 14 publications

Psychosomatic symptoms questionnaire (PSQ-39): a psychometric study among general population of Iranian adults

Psychosomatic symptoms questionnaire (PSQ-39): a psychometric study among general population of Iranian adults

Measurement Properties of the Patient Health Questionnaire–15 and Somatic Symptom Scale–8

Psychometric evaluation of the somatic symptom scale − 8 in patients with somatic symptom disorder in Iran

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