---
title: Which countries are included in the international norm?
description: "For OPTO, the International norm is based on the national norms (in all N = 16589): The International norm is a weighted average of all the local samples, ensuring equal representativeness for all cou"
---

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# 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.

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