Hi Lotte,

I don't know too much about ordinal regression, but 28 points for your DV sounds like rather a lot for this approach. It seems quite unsurprising that model slope coefficients would vary across response categories when there are so many response categories.

Sorry to go back to basics, but I'm wondering what happens when you fit a simple linear regression model? Is there a clear problem with the distribution of residuals that precludes this approach?