Table 1

CMV force of infection, basic reproductive rates, and average age of infection among persons 12–49 years old in the United States.

Force of Infection (95% CI)*
 Basic reproductive rate (95% CI)
 Average age of infection in years (95% CI)
Entire U.S. population
 1.6
 1.3–1.9
 1.7
 1.5–1.8
 28.6
 27.3–29.4
Sex





     Female
 1.8
 1.3–2.2
 1.7
 1.5–1.9
 28.0
 26.2–29.9
     Male
 1.5
 1.1–1.8
 1.6
 1.4–1.8
 29.1
 27.7–30.6
Race/Ethnicity





     Non-Hispanic Black
 5.7
 5.1–6.2
 4.1
 3.7–4.4
 16.3
 15.1–17.5
     Mexican American
 5.1
 4.3–5.6
 3.7
 3.2–4.2
 17.5
 15.8–19.4
     Non-Hispanic White
 1.4
 1.1–1.8
 1.6
 1.4–1.7
 29.3
 27.9–30.6
Income per family size





     Low
 3.5
 2.8–4.5
 2.7
 2.1–3.2
 21.9
 19.0–24.9
     Middle
 2.1
 1.6–2.6
 1.9
 1.7–2.2
 26.7
 24.9–28.6
     High
 1.5
 1.1–1.9
 1.6
 1.4–1.8
 28.9
 27.5–30.4

*Number of infections per 100 susceptible persons per year. We considered parameter differences to be statistically significant when corresponding confidence intervals did not overlap. CI, confidence interval.

Colugnati et al. BMC Infectious Diseases 2007 7:71   doi:10.1186/1471-2334-7-71