Table 2.

Effect of Vaccine Introduction on Pneumonia Hospitalizations and Deaths by Child Age

	Annual Rate of Change (95% CI) in the Number of Pneumonia Hospitalizations or Deaths: Prevaccine (January 2009–October 2010)	Absolute Change in the Number (95% CI) of Pneumonia Hospitalizations or Deaths: Vaccine Introduction (October 2010–January 2013)	Annual Rate of Change (95% CI) in the Number of Pneumonia Hospitalizations or Deaths: Postvaccine (January 2013–December 2017)
Pneumonia hospitalizations
All ages	1.24 (.94, 1.64)	−48.3% (−62.4%, −28.9%)	.94 (.89, .99)
1–11 m	1.39 (1.02, 1.91)	−57.5% (−70.2%, −39.3%)	.94 (.88, .999)
12–59 m	1.03 (.77, 1.37)	−29.9% (−49.6%, −2.7%)	.94 (.89, .996)
Pneumonia deaths
All ages	1.59 (.87, 2.90)	−50.1% (−74.9%, −.8%)	.78 (.67, .92)
1–11 m	1.44 (.70, 2.99)	−51.8% (−79.2%, +11.9%)	.83 (.69, 1.01)
12–59 m	1.94 (.82, 4.61)	−49.5% (−80.5%, +30.9%)	.70 (.54, .90)

The rates of change in the number of hospitalizations and deaths per year are presented for the pre- and postvaccine periods. Changes in the number of hospitalizations (or deaths) related to vaccine introduction were calculated as the difference between the number of pneumonia hospitalizations (or deaths) at the end of the prevaccine period and the start of the postvaccine period.

Abbreviation: CI, confidence interval.