For the final article of my PhD-thesis, I need to analyze various categorical results.

My goal is to find whether a certain genotype will give a predisposition to no, few or many side-effects after taking medication.

To ascertain this, I used multinomial logistic regression in SPSS, with the number of side-effects as output/dependent variable. The genotype I set up as a scale variable, as we work with an allele dosage model. Because of this, I entered the genotype as a covariate rather than a factor, as I was taught that categorical data belongs in the "factor box".

However, when running the analysis, I get no significance for my model fit. How can I tackle this problem? Is there a better way to perform this analysis than multinomial?

I already looked at Pearson's Chi Square, but I have more than 2 groups in both variables.

If anyone could help me, that person would be a real life-saver!

Thanks very much in advance!