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I am attempting to analyse pre-existing data (using SPSS). I have one group of participants, 4 quantitative, non-parametric outcome measures, and am looking to see if there is a change in outcomes post intervention. I also have qualitative outcomes, but am not worrying about them yet! I understand that t-tests (and the non-parametric equivalents) can be used for comparing several groups (i.e. if I had a control group as well), but don't know what to do with my single group of participants.