Variables | Pearson’s r | |||||||
---|---|---|---|---|---|---|---|---|
Glucose, mg/dl | p | Insulin, U/ml | p | C-peptide, ng/ml | p | HOMA2-IR | p | |
Insulin, U/ml | ||||||||
Patients with RA | 0.686* | < 0.001 | ||||||
Controls | 0.872* | |||||||
C-peptide, ng/ml | ||||||||
Patients with RA | 0.818* | < 0.001 | 0.915* | < 0.039 | ||||
Controls | 0.942* | 0.947* | ||||||
HOMA2-IR | ||||||||
Patients with RA | 0.724* | < 0.001 | 0.998* | 0.003 | 0.928* | 0.13 | ||
Controls | 0.874* | 0.999* | 0.949* | |||||
HOMA2-%β C-peptide | ||||||||
Patients with RA | 0.254* | < 0.001 | 0.794* | < 0.001 | 0.747* | < 0.001 | 0.767* | < 0.001 |
Controls | 0.855* | 0.940* | 0.975* | 0.942* |
Correlations were made with the predictive data of the adjusted model (for age, sex, waist circumference, dyslipidemia, statins, antihypertensive treatment, CRP, cholesterol levels, and glucocorticoid intake) from Table 2. P represents the p value for the comparison of Pearson’s correlation coefficient between patients and controls using the Fisher r-to-z transformation.
↵* p value < 0.001 only for the Pearson’s correlation coefficient. HOMA: homeostasis model assessment; IR: insulin resistance calculated with insulin; %β: β-cell production calculated with C-peptide; RA: rheumatoid arthritis.