SPSS advise

please help
I have 27 patients in my study, and I collected their blood glucose measurements for 7 days ( so I have about 21 readings for each patient), I have only one group but I can divide them into two groups according to the mean of all the blood glucose measurements in which one group has controlled glucose and the other is uncontrolled .

my outcome is the glycaemic control and my independent variable are continuous ( carbohydrates intake and insulin )

I also have some confounding factors

which test is appropriate to have the best answer?
I wanted to compare between the two groups in carbohydrate intake and see if there is a relationship after I adjust for confounders
and I also want to do the same thing with insulin