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The authors are grateful to William Revelle and an anonymous reviewer for helpful comments on a previous version of this manuscript and suggestions for improvements.
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Eisinga, R., Grotenhuis, M.t. & Pelzer, B. The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown?. Int J Public Health 58, 637–642 (2013). https://doi.org/10.1007/s00038-012-0416-3
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DOI: https://doi.org/10.1007/s00038-012-0416-3