Figure 3).

Monthly hospital admissions for chronic systolic heart failure with New York Heart Association (NYHA) functional class III or IV and I or II. Results shows that hospitalization peaks occurred in January and August for persons with NYHA functional class III and IV, while numbers of chronic systolic heart failure-related hospitalizations for NYHA functional class I and II exhibited no obvious seasonal variation. Apr April; Aug August; Dec December; Feb February; Jan January; Jul July; Jun June; Sep September; Oct October; Nov November; Mar March