Norm
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      1. Frequently Asked Questions
      2. OPTO
      3. Norm

      Which countries are included in the international norm?

      For OPTO, the International norm is based on the national norms (in all N = 16589):

      • UK (N=536)
      • US (N=951)
      • Norway (N=5893)
      • Denmark (N=1696)
      • Sweden (N=3863)
      • Finland (N=1192)
      • Germany (N=487)
      • Switzerland (German speaking) (N=1055)
      • Mexico (N=530)
      • France/Switzerland (French speaking) (N=386)

      The International norm is a weighted average of all the local samples, ensuring equal representativeness for all countries included. National samples are included in the International norm if they have at least 300 responses locally.