“…Without ME/I, an unknown proportion of any observed intergroup difference could be because of differences in measurement, rather than true differences in the degree of SQOL. Given that the SQOL-9 is explicitly marketed as the preferred instrument for cross-worldview SQOL research (Skevington et al, 2013), and is already being used to compare SPIRITUAL QUALITY OF LIFE 5 SQOL across worldview groups (e.g., Akrawi et al, 2017), it is important to provide evidence that the instrument measures the same factors across NRS, SNR, and RS samples.…”