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Psychometric analysis confirmed that the Allport-Ross Religious Orientation Scale measures three distinct dimensions of religiousness: I, Ep, and Es. On the basis of this analysis a more internally consistent intrinsic scale was proposed. Comparisons of five religious groups indicated that religious affiliation mediated relationships between religious orientation and independent variables. Intrinsicness predicted lower depression for Christian respondents but was unrelated to depression for the nonChristian subsamples. Ep and Es were significantly related to higher depression for Unitarians. Low reliabilities for the extrinsic subfactor scales may be remedied by adding three new items to each scale.
Vicky Genia (1993) studied this question.