I was wondering if we could interpret a questionnaires score without having norms? For example if someone administers a perceived stress questionnaire on someone how can we interpret the results of there are no culturally adapted norms?? Will it fair to be use the same cut off scores from parent culture ?
You have a non-stressed control group and then you compare your results between your stressed versus non-stressed groups.
Using culturally adapted instrument is advisable in research to get the true magnitude or epidemiology of a condition. If not possible you can use the tool which is validated in related culture or socioeconomic status with possible translation to local language as well as pretesting the questionnaires in representative sample. You can also use pilot study with translated version.
To add on the above answer, in-order to change the cut point or add as well as reduce questionnaire or tool you need to validate it.
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