DC = Danger-Contamination Scale; SES = Socioeconomic Consequences Scale; XN = Xenophobia Scale; TR = Traumatic Stress Scale; CK = Checking Scale; I χ 2 = overall test of measurement invariance across items; a χ 2 = test of measurement invariance in item discrimination values; b χ 2 = test of measurement invariance in item difficulty parameters. Chi square values from specific measurement invariance tests presented in cells; bold denotes a statistically significant chi square value at p < .05. Significant values here suggest that an item or item parameter may be non-invariant across time (i.e., significant differences across time).The initial “All Items” sweep was conducted to identify anchor items and items that may demonstrate non-invariance. This process may over-identify non-invariance however, and so more targeted follow-up tests were conducted using the items and parameters that demonstrated invariance at a previous stage as anchors. The exception was that the presence of non-invariance in the discrimination value suggests that the whole item should be treated as functioning differently across time, even if there is no evidence for non-invariance in the difficulty parameters (i.e., equal difficulty in the absence of equal discrimination values is not particularly meaningful). In all models Time 1 was treated as the reference group (factor mean and variance fixed to 0 and 1, respectively) and Time 2 was treated as the focal group (factor and variance freely estimated). (DOCX)