Nagata Jason M, Compte Emilio J, McGuire F Hunter, Lavender Jason M, Brown Tiffany A, Capriotti Matthew R, Flentje Annesa, Lubensky Micah E, Obedin-Maliver Juno, Lunn Mitchell R
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.
Body Image. 2024 Dec;51:101798. doi: 10.1016/j.bodyim.2024.101798. Epub 2024 Oct 14.
Muscle dysmorphia (MD) is characterized by extreme preoccupation with insufficient muscularity that prompts pathological behaviors and distress/impairment. The Muscle Dysmorphic Disorder Inventory (MDDI) - a widely used measure of MD symptoms - has yet to be validated among transgender women, despite emerging evidence suggesting risk for muscularity-oriented concerns in this population. We examined the MDDI factor structure as well as the reliability and validity of its subscales in a sample of 181 transgender women ages 19-73 years who participated in a national longitudinal cohort study of U.S. sexual and gender minority adults. Confirmatory factor analysis was used to examine model fit for the original three-factor structure of the MDDI (drive for size, appearance intolerance, functional impairment). A re-specified three-factor model allowing covariance of residuals for two conceptually related items demonstrated good overall fit (χ/df = 1.33, CFI =.94, TLI =.93, RMSEA =.06 [95 % CI =.01,.09], SRMR =.07). Moreover, results supported the internal consistency and convergent and discriminant validity of the MDDI subscales in transgender women. Findings inform the use of the MDDI among transgender women and provide a foundation to support future research on the MDDI and MD symptoms among gender minority populations.
肌肉畸形症（MD）的特征是过度关注肌肉不足，从而引发病理行为和痛苦/功能障碍。肌肉畸形症障碍量表（MDDI）——一种广泛使用的MD症状测量工具——在跨性别女性中尚未得到验证，尽管新出现的证据表明该人群存在对肌肉量相关问题的风险。我们在181名年龄在19至73岁之间的跨性别女性样本中，研究了MDDI的因子结构及其子量表的信度和效度，这些女性参与了一项关于美国性取向和性别少数群体成年人的全国纵向队列研究。验证性因子分析用于检验MDDI原始三因子结构（追求体型、外观不耐受、功能障碍）的模型拟合度。一个重新指定的三因子模型允许两个概念相关项目的残差协方差，显示出良好的整体拟合度（χ/df = 1.33，CFI =.94，TLI =.93，RMSEA =.06 [95% CI =.01，.09]，SRMR =.07）。此外，结果支持了MDDI子量表在跨性别女性中的内部一致性、收敛效度和区分效度。研究结果为跨性别女性使用MDDI提供了参考，并为支持未来关于性别少数群体中MDDI和MD症状的研究奠定了基础。
