Factors Associated with Hepatitis A Vaccination Receipt in One-Year-Olds in the State of Michigan

Table 2

Adjusted odds ratios and 95% confidence intervals of hepatitis A vaccination receipt^a among 1-year-olds given by the final logistic regression model*.

Variable	Odds Ratio	95% CI
No. months^b	1.02	(1.02, 1.03)
Race/Ethnicity
White (non-Hispanic)	Reference	Reference
American Indian	1.24	(0.89, 1.74)
Asian/Pacific Islander	1.75	(1.58, 1.95)
Black (non-Hispanic)	1.09	(1.01, 1.17)
Hispanic	1.14	(1.01, 1.29)
Mother’s age
20–34 years	Reference	Reference
<20 years	1.06	(1.00, 1.13)
>35 years	0.98	(0.93, 1.03)
Provider Type
Private	Reference	Reference
Public	1.19	(1.13, 1.25)
Medicaid and WIC enrollment
Neither service	Reference	—
Medicaid only^c	1.14	(1.06, 1.23)
WIC only^c	0.98	(0.91, 1.05)
Both services^c	1.38	(1.31, 1.44)
Geographic location
Rural residence	0.88	(0.80, 0.96)
MCIR regions 1, 2 and 4	Reference	Reference
MCIR region 3	0.75	(0.70, 0.81)
MCIR region 5	0.75	(0.70, 0.80)
MCIR region 6	0.59	(0.53, 0.66)
Interaction Variables	OR	95% CI
Medicaid enrollment x
Hispanic	1.83	(1.40, 2.41)
WIC enrollment x
Black	1.17	(1.01, 1.34)
Hispanic	1.35	(1.10, 1.67)
Medicaid & WIC enrollment x
Black	1.17	(1.05, 1.29)
Hispanic	1.32	(1.12, 1.56)

^aReceipt of vaccination means the child has received one or more doses before their 2nd birthday.
^bNo. months = number of months since the May 1, 2006 vaccination recommendation of the child’s 1st birthday.
^cMedicaid and WIC enrollment on the child’s first birthday.
^∗Logistic regression model run with a sample size of 118686, due to missing/unknown values; all two-way interactions for race/ethnicity and Medicaid/WIC enrollment and race/ethnicity and provider type were tested for, but only those with significant 𝑃-values (<.05) were included in the final model.