TABLE 2.
Comparison of Infants With County of Residence Listed Included in the Analyses and Infants Without County of Residence Excluded From the Analyses
| Infants With County of Residence, N = 121 596 (94%) | Infants Without County of Residence, N = 7745 (6%) | |
|---|---|---|
| Mean age (mo) | 5.5 | 5.6 |
| Mean number of vaccines | 6.9 | 4.9 |
| Mean number of pertussis-containing vaccines | 1.5 | 1.1 |
| % of infants UTD with pertussis-containing vaccinea | ||
| Preepidemic | 67.4 | 49.2 |
| Epidemic | 69.5 | 41.6 |
| Postepidemic | 67.6 | 37.5 |
a
“UTD” is defined as greater than or equal to the number of doses recommended by the ACIP, that is, ≥1 dose by 3 mo of age, ≥2 doses by 5 mo of age, and ≥3 doses by 7 mo of age.