Figure 2. Annualized rates of parapneumonic empyema related hospitalizations per 100,000 children <18 years (95% CI) by PCV period and age group, United States (1997–2013).
Legend: Annualized rates of hospitalization for parapneumonic empyema by age group and PCV period, per 100,000 children. Error bars represent the 95% confidence interval of the rate of hospitalizations for parapneumonic empyema by age group and period.