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Which statistical test to choose?
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Hello. I'm from Germany (please excuse my english) and I have an assignment due in 9 days about a retrospective cohort study. Normally, I wouldn't want to bother you, but my supervisor has been ignoring me for 3 weeks straight, so I thought I could get some help here. I'm also terrible at statistics.

I have a cohort of patients who have had a spinal implant. I have divided my cohort into two groups: one group that received an spinal implant for the first time, and another group that had it replaced because the old implant was loose (=revision surgery).

I want to investigate whether the mean value for age, BMI and two other numerical variables is higher in the group that received revision surgery than the group that received the implant for the first time. Is the t-test appropriate for this? Would it be professional to perform a t-test for each individual variable (=4 T-tests), or is this too much?

Thank you so much.

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4 months ago