I have 39 factors in the questionnaire filled in by diabetic people and 29 factors in the one's filled by non diabetic people. I want to reduce the factors in both questionnaires separately i-e, I am applying factor analysis in both the data sets separately.

How do I know which factors are extracted for further analysis, I mean which of the factors should I use and which of the factors should I subtract for further analysis? How would I know?

attaching the entered data( excel file, however I am using spss) 

also attaching the used questionnaires

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