Can an academic PhD thesis have more than one hypothesis? I am working on writing my PhD thesis after four long years of work. I'm writing the hypothesis sections, and I am finding it extremely hard to write one single hypothesis that is comprehensive and specific enough without using vague wording. Can I have three hypotheses for my thesis?

For background: my work is in medical informatics, and my thesis work can be divided into three steps:


I evaluated existing models in the literature against our hospital's dataset using a novel approach and demonstrated that their performance is not great;
I developed my own model, which is better;
I implemented it in the hospital, with decent results.


Can I have those three as hypotheses? [1) existing models perform worse than X; 2) a model that is X% better can be built using machine learning; and 3) implementing a model in the hospital can lead to XYZ]? Or do I have to find just one overarching hypothesis and make those three the goals?
This is the sort of thing that you should discuss with your advisor if you have questions. This may be field specific; that said, I'd be surprised if there was any sort of specific limit on the number of hypotheses discussed in a thesis.