Objective

To investigate aspects of validity and reliability of the Swedish version of the Self-Efficacy for Managing Chronic Disease (SEMCD-Swe) scale in systemic sclerosis (SSc).

Method

A forward–backward translation procedure was used. Content validity was assessed through interviews with 11 people with SSc and 10 healthcare professionals. Construct validity, internal consistency, test–retest reliability, and floor and ceiling effects were evaluated in 104 SSc patients.

Results

The content validity of the SEMCD-Swe was interpreted as satisfactory, but some adjustments were made to increase the understanding. Confirmatory factor analysis supported a single-factor structure. Moderate to strong correlations between the SEMCD-Swe and Scleroderma Health Assessment Questionnaire; Multidimensional Assessment of Fatigue; Patient Health Questionnaire-8 (r_s = −0.4 to −0.7), and RAND-36 subscales (r_s = 0.5 to 0.7) were found. Weak correlations were found between SEMCD-Swe and modified Rodnan skin score; and disease severity of peripheral vascular and lung (r_s = −0.1 to −0.2) and kidney (r_s = 0.1) systems (Medsger severity scale). Cronbach’s alpha was sufficient (0.85) and corrected item-to-total correlations were good (≥ 0.50). The intraclass correlation coefficient for the total score was sufficient (0.82). No floor or ceiling effects were found.

Conclusion

Support for construct validity was indicated, as the SEMCD-Swe in SSc show a single-factor structure and is more strongly associated with pain, fatigue, depressive symptoms, interferences with daily activities, disability, and quality of life than with disease severity. Our results also indicate support for content validity and reliability. However, the responsiveness of the SEMCD-Swe needs to be tested.

中文翻译：

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瑞典版慢性病自我效能量表对系统性硬化症患者的有效性和可靠性

客观的

调查瑞典版慢性病自我效能 (SEMCD-Swe) 量表在系统性硬化症 (SSc) 中的有效性和可靠性方面。

方法

使用了前后翻译程序。通过采访 11 名 SSc 患者和 10 名医疗保健专业人员来评估内容有效性。在 104 名 SSc 患者中评估了结构效度、内部一致性、重测信度以及地板和天花板效应。

结果

SEMCD-Swe 的内容效度被认为是令人满意的，但为了增加理解做了一些调整。验证性因素分析支持单因素结构。SEMCD-Swe 与硬皮病健康评估问卷之间的中度至强相关性；疲劳的多维评估；发现了患者健康问卷 8（rs  = -0.4 至 -0.7）和 RAND-36 分量表（rs ₌  0.5 至 0.7）_。SEMCD-Swe 与改良的 Rodnan 皮肤评分之间存在弱相关性；外周血管和肺（r _s  = -0.1 至 -0.2）和肾脏（r _s = 0.1) 系统（Medsger 严重程度等级）。Cronbach's alpha 是足够的 (0.85) 并且校正的项目与总相关性良好 (≥ 0.50)。总分的组内相关系数是足够的（0.82）。没有发现地板或天花板效应。

结论

支持结构效度，因为 SSc 中的 SEMCD-Swe 显示单因素结构，与疼痛、疲劳、抑郁症状、日常活动干扰、残疾和生活质量的相关性比与疾病严重程度的相关性更强。我们的结果还表明支持内容的有效性和可靠性。但是，需要测试 SEMCD-Swe 的响应能力。