Factorial validity and invariance of four psychosocial constructs of colorectal cancer screening: does screening experience matter?
Factorial validity and invariance of four psychosocial constructs of colorectal cancer screening: does screening experience matter?
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DOI：
10.1158/1055-9965.epi-13-0565
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发表时间：
2013-12
期刊：
影响因子：
--
通讯作者：
Vernon SW
中科院分区：
文献类型：
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作者：
Murphy CC;McQueen A;Bartholomew LK;Del Junco DJ;Coan SP;Vernon SW
很少有研究检查与结直肠癌筛查（CRCS）相关的测量结构的心理测量特性和不变性。我们试图：1）评估与 CRCS 相关的四个核心结构（益处、障碍、自我效能和乐观）的因子有效性； 2）通过筛选状态（当前筛选、过期、从未筛选）检查测量不变性。我们使用纵向行为干预试验的基线调查数据来提高美国退伍军人的 CRCS。受访者被分为当前筛查 (n=3,498)、逾期筛查 (n=418) 和从未筛查 (n=1,277)。使用随机一半样本开发测量模型，然后使用另一半样本和完整基线样本进行验证 (n=5,193)。使用单组和多组验证性因素分析来检查筛选状态的测量不变性。四因素测量模型显示出良好的拟合度。当比较从未筛查和逾期进行 CRCS 的参与者时，因子负荷、项目截距以及剩余项目方差和协方差是不变的，这表明严格的测量不变性。所有因子负荷在当前筛选组和逾期组中均保持不变。只有福利规模在当前筛选者和从未筛选者中是不变的。非不变项主要来自障碍量表。我们的研究结果为 CRCS 益处、障碍、自我效能和乐观量表的构建有效性提供了额外的支持。更好地了解当前筛选器和从未筛选器之间的差异可能会提高测量的不变性。收益、障碍、自我效能和乐观程度的衡量标准可用于指定干预目标，并有效评估筛查组干预前后的变化。
Few studies have examined the psychometric properties and invariance of scales measuring constructs relevant to colorectal cancer screening (CRCS). We sought to: 1) evaluate the factorial validity of four core constructs associated with CRCS (benefits, barriers, self-efficacy, and optimism); and 2) examine measurement invariance by screening status (currently screened, overdue, never screened). We used baseline survey data from a longitudinal behavioral intervention trial to increase CRCS among U.S. veterans. Respondents were classified as currently screened (n=3,498), overdue (n=418), and never screened (n=1,277). The measurement model was developed using a random half of the sample and then validated with the second half of the sample and the full baseline sample (n=5,193). Single- and multi-group confirmatory factor analysis was used to examine measurement invariance by screening status. The four-factor measurement model demonstrated good fit. Factor loadings, item intercepts, and residual item variance and covariance were invariant when comparing participants never screened and overdue for CRCS, indicating strict measurement invariance. All factor loadings were invariant among the currently screened and overdue groups. Only the benefits scale was invariant across current screeners and never screeners. Noninvariant items were primarily from the barriers scale. Our findings provide additional support for the construct validity of scales of CRCS benefits, barriers, self-efficacy, and optimism. A greater understanding of the differences between current and never screeners may improve measurement invariance. Measures of benefits, barriers, self-efficacy, and optimism may be used to specify intervention targets and effectively assess change pre- and post-intervention across screening groups.