Table 3.

Multivariable Logistic Regression and Predictive Marginal Analysis of Tdap Vaccination (≥1 Dose) Among Adolescents

Characteristic	Adjusted prevalence ratioa (95% CI)
Age (years)
13–15b	ref
16–17	0.97 (0.95, 0.99)c
Race/ethnicity
Non-Hispanic whiteb	ref
Non-Hispanic black	1.03 (0.99, 1.07)
Hispanic	1.05 (1.01, 1.08)c
American Indian/Alaskan Native	1.05 (0.99, 1.12)
Asian	1.05 (1.00, 1.10)
Other	1.03 (0.98, 1.08)
Physician contacts within past year
Noneb	ref
1	1.03 (0.99, 1.07)
2–3	1.05 (1.01, 1.09)c
≥4	1.04 (1.00, 1.08)
Well-child visit at age 11–12 yearsd
Yesb	ref
No	0.88 (0.86, 0.91)c
Don’t know	0.90 (0.88, 0.92)c
Number of providers
1	1.07 (1.03, 1.11)c
2	1.06 (1.02, 1.10)c
≥3b	ref
Region
Northeast	0.99 (0.96, 1.03)
Midwest	0.97 (0.94, 1.00)
South	0.95 (0.92, 0.98)c
Westb	ref
Facility type
All private facilitiesb	ref
All public facilities	0.99 (0.95, 1.03)
All hospital facilities	0.96 (0.91, 1.00)
All STD/school/teen clinics or other facilities	0.99 (0.91, 1.07)
Mixede	1.09 (1.06, 1.12)c
Otherf	1.06 (0.97, 1.16)
Parental report of provider recommendation for vaccine
Yes	1.06 (1.04, 1.08)c
Nob	ref

Note: Boldface indicates statistical significance (p < 0.05).

^aPrevalence ratios were also adjusted by several variables that were not significant in the model, and those variables include gender, mother’s educational level, mother’s marital status, mother’s age, birth country, poverty level, type of health insurance and vaccine finance, and metropolitan statistical area (MSA).

^bReference level.

^cp <0.05 compared to reference level.

^dStatus of healthcare visit at age 11–12 years based on provider-reported data.

^eMixed indicates that the facility is identified to be in more than one of the facility categories such as private, public, hospital, STD/school/teen clinics.

^fIncludes military, WIC clinics, and pharmacies.

STD, sexually transmitted diseases; Tdap, Tetanus, diphtheria, and acellular pertussis; WIC, the National Special Supplemental Nutrition Program for Women, Infants, and Children.