Psychometric validation of the Muscle Dysmorphic Disorder Inventory (MDDI) among U.S. transgender men,Body Image

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Psychometric validation of the Muscle Dysmorphic Disorder Inventory (MDDI) among U.S. transgender men
Body Image ( IF 5.2 ) Pub Date : 2022-05-31 , DOI: 10.1016/j.bodyim.2022.05.001
Jason M Nagata ₁ , Emilio J Compte ₂ , F Hunter McGuire ₃ , Jason M Lavender ₄ , Stuart B Murray ₅ , Tiffany A Brown ₆ , Matthew R Capriotti ₇ , Annesa Flentje ₈ , Micah E Lubensky ₉ , Juno Obedin-Maliver ₁₀ , Mitchell R Lunn ₁₁

Affiliation

Department of Pediatrics, University of California, San Francisco, San Francisco, CA, USA.
Eating Behavior Research Center, School of Psychology, Universidad Adolfo Ibáñez, Santiago, Chile; Research Department, Comenzar de Nuevo Treatment Center, Monterrey, Mexico.
The Brown School, Washington University in St. Louis, St. Louis, MO, USA.
Military Cardiovascular Outcomes Research Program (MiCOR), Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA; The Metis Foundation, San Antonio, TX, USA.
Department of Psychiatry and Behavioral Sciences, University of Southern California, Los Angeles, CA, USA.
Department of Psychological Sciences, Auburn University, Auburn, AL, USA.
Department of Psychology, San José State University, San Jose, CA, USA; The PRIDE Study/PRIDEnet, Stanford University School of Medicine, Stanford, CA, USA.
The PRIDE Study/PRIDEnet, Stanford University School of Medicine, Stanford, CA, USA; Department of Community Health Systems, University of California, San Francisco, San Francisco, CA, USA; Alliance Health Project, Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA, USA.
The PRIDE Study/PRIDEnet, Stanford University School of Medicine, Stanford, CA, USA; Department of Community Health Systems, University of California, San Francisco, San Francisco, CA, USA.
The PRIDE Study/PRIDEnet, Stanford University School of Medicine, Stanford, CA, USA; Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA, USA; Department of Epidemiology and Population Health, Stanford University School of Medicine, Stanford, CA, USA.
The PRIDE Study/PRIDEnet, Stanford University School of Medicine, Stanford, CA, USA; Department of Epidemiology and Population Health, Stanford University School of Medicine, Stanford, CA, USA; Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.

Muscle dysmorphia (MD) is characterized by a pervasive belief or fear of insufficient muscularity and an elevated drive for muscularity, representing the pathological and extreme pursuit of muscularity. Psychometric properties of one of the most widely used measures of MD symptoms—the Muscle Dysmorphic Disorder Inventory (MDDI)—have yet to be evaluated in transgender men despite emerging evidence suggesting differential risk for MD symptoms in this population. In this study, we assessed the psychometric properties of the MDDI in a sample of 330 transgender men ages 18–67 years who participated in a large-scale national longitudinal cohort study of sexual and gender minority adults in the U.S. Using a two-step, split-sample approach, an initial exploratory factor analysis supported a three-factor structure and a subsequent confirmatory factor analysis of a re-specified three-factor model demonstrated good overall fit (χ²/df = 1.84, CFI =0.94, TLI =0.92, RMSEA =0.07 [90% CI =0.05,.09], SRMR =0.08). Moreover, results supported the internal consistency and convergent validity of the MDDI subscales in transgender men. Findings inform the use of the MDDI among transgender men and provide a foundation to support further work on the MDDI and MD symptoms among gender minority populations.

中文翻译：

美国跨性别男性肌肉畸形障碍量表 (MDDI) 的心理测量验证

肌肉畸形（MD）的特点是普遍相信或害怕肌肉不足和对肌肉发达的强烈驱动力，代表了对肌肉发达的病态和极端追求。尽管有新的证据表明该人群中 MD 症状的风险存在差异，但最广泛使用的 MD 症状测量指标之一——肌肉变形障碍量表 (MDDI) 的心理测量特性尚未在跨性别男性中进行评估。在这项研究中，我们以 330 名 18-67 岁的跨性别男性为样本，评估了 MDDI 的心理测量特性，这些男性参与了一项针对美国性少数和性别少数成年人的大规模全国纵向队列研究，采用两步法，采用分割样本方法，初始探索性因素分析支持三因素结构，随后对重新指定的三因素模型进行的验证性因素分析显示出良好的整体拟合度（χ ² / df = 1.84，CFI = 0.94，TLI = 0.92 ，RMSEA = 0.07 [90% CI = 0.05,.09]，SRMR = 0.08）。此外，结果支持跨性别男性 MDDI 分量表的内部一致性和收敛有效性。研究结果为跨性别男性使用 MDDI 提供了信息，并为支持进一步研究性别少数人群的 MDDI 和 MD 症状奠定了基础。

更新日期：2022-05-31

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