PURPOSE The study of mental wellbeing requires reliable, valid, and practical measurement tools. One of the most widely used measures of mental wellbeing is the Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS). Our aim was to examine the psychometric properties of SWEMWBS (a brief seven-item version) in a 'real-world' population sample of young people. METHODS We used data from the 2017 School Health Research Network Student Health and Wellbeing Survey, completed by 103,971 students in years 7 to 11 from 193 secondary schools in Wales. We first estimated polychoric correlation matrices for the whole sample and by school year, and undertook a principal components analysis to check for configural invariance. Subsequently, we used a multiple-groups structural equation model with successively greater constraints to test measurement invariance. To examine external construct validity, we calculated correlations between the SWEMWBS score and four covariates: life satisfaction, somatisation, school pressure and bullying victimisation. RESULTS Parallel analysis suggested that extraction of one factor was appropriate both overall and in each year group. Inspection of standardised loadings suggested that four items had progressively stronger correlations with the factor as students are older, but change in fit indices between models suggested that loadings and thresholds, but not residual variances, were invariant by age group. SWEMWBS scores were moderately correlated with measures of life satisfaction and somatisation, and weakly to moderately correlated with school pressure and bullying victimisation. CONCLUSIONS This study adds to the growing evidence that SWEMWBS is appropriate for measuring mental wellbeing in young people and suggests that SWEMWBS is appropriate for tracking the development of wellbeing across adolescence.

中文翻译：

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短期的Warwick-Edinburgh心理健康量表的测量不变性和外部建构效度在威尔士的大量全国中学生中进行了测量。

目的研究心理健康需要可靠，有效和实用的测量工具。Warwick-Edinburgh心理健康量表（WEMWBS）是心理健康中使用最广泛的量度之一。我们的目的是在年轻人的“真实世界”人口样本中研究SWEMWBS（简短的七个项目）的心理计量特性。方法我们使用了2017年学校健康研究网络学生健康与幸福调查的数据，该数据由威尔士193所中学的7到11年级的103,971名学生完成。我们首先估算整个样本和学年的多元相关矩阵，然后进行主成分分析以检查结构不变性。随后，我们使用具有更大约束的多组结构方程模型来测试测量不变性。为了检验外部结构的有效性，我们计算了SWEMWBS得分与四个协变量之间的相关性：生活满意度，身体状况，学校压力和欺凌行为。结果平行分析表明，从总体上和每年的组别中，提取一种因子是适当的。对标准荷载的检查表明，随着学生年龄的增长，四个项目与因子的相关性逐渐增强，但是模型之间的拟合指数变化表明，荷载和阈值（而非剩余方差）随年龄组而不变。SWEMWBS得分与生活满意度和躯体化程度呈中等程度的相关性，并与学校压力和欺凌受害程度微弱或中等相关。结论这项研究增加了越来越多的证据，表明SWEMWBS适用于测量年轻人的心理健康，并表明SWEMWBS适用于追踪青春期的健康发展。