Patients with multiple comorbidities had a higher risk of hospitalization for heart failure: zero comorbidities – odds ratio 0.43, 95% confidence interval 0.28 – 0.67, p < 0.001; a comorbidity – odds ratio 0.69, 95% confidence interval 0.47 – 1.01, p = 0.057; two comorbidities – odds ratio 1.85, 95% confidence interval 1.05