Factors Associated with Antenatal Influenza Vaccination in a Medically Underserved Population
Table 2
Factors associated with antenatal influenza vaccination among pregnant women with deliveries.
Characteristic
Vaccination rate (%)
Vaccination unadjusted RR (95% CI)
Vaccination adjusted RR (95% CI)
Age at delivery (years)
<21
46.1
0.92 (0.84–1.01)
0.98 (0.88–1.09)
21–34
50.0
ref
ref
>34
52.3
1.05 (0.96–1.14)
1.00 (0.91–1.09)
Race/ethnicity
Black, non-Hispanic
44.4
ref
ref
Hispanic
64.2
1.44 (1.35–1.54)
1.38 (1.24–1.52)
Other, non-Hispanic
63.9
1.44 (1.29–1.60)
1.21 (1.07–1.38)
White, non-Hispanic
37.1
0.83 (0.66–1.06)
1.06 (0.84–1.33)
Interpreter use
No interpreter
46.0
ref
ref
Spanish
64.6
1.40 (1.31–1.51)
1.00 (0.90–1.12)
Other language
58.7
1.28 (1.15–1.42)
1.17 (1.04–1.32)
Parity
0
48.9
ref
ref
1
52.7
1.08 (0.95–1.23)
1.06 (0.94–1.21)
2
52.9
1.08 (0.99–1.19)
1.05 (0.96–1.16)
≥3
48.1
0.99 (0.91–1.07)
0.96 (0.87–1.06)
Chronic medical condition
Asthma
48.2
0.96 (0.86–1.08)
1.06 (0.94–1.19)
Cardiovascular disease
45.5
0.91 (0.63–1.33)
1.12 (0.78–1.59)
Diabetes mellitus
64.6
1.31 (1.12–1.52)
1.29 (1.11–1.51)
HIV-positive status
58.0
1.17 (0.97–1.41)
1.18 (0.97–1.42)
Tobacco use in pregnancy
37.2
0.73 (0.64–0.83)
0.85 (0.75–0.97)
Prenatal care adequacy
Inadequate
43.5
0.64 (0.59–0.69)
0.68 (0.63–0.73)
Intermediate
66.9
0.98 (0.91–1.06)
1.00 (0.92–1.09)
Adequate
68.3
ref
ref
Adequate plus
68.3
1.00 (0.91–1.10)
1.00 (0.90–1.11)
Unknown
22.1
0.32 (0.28–0.38)
0.33 (0.28–0.40)
Primary insurance type
Self-pay
38.9
0.81 (0.65–1.00)
1.07 (0.86–1.32)
Medicaid
50.7
1.05 (0.91–1.22)
1.09 (0.93–1.28)
Medicare
31.6
0.65 (0.33–1.29)
0.76 (0.38–1.51)
Private
48.3
ref
ref
Influenza vaccination was defined as documented administration of influenza vaccine in the Grady Health System EHR, the Georgia Registry of Immunization Transactions and Services, or self-reported receipt of influenza vaccine within the time frame of twelve months before delivery and the delivery date. Data are %, relative risk (95% confidence interval), and adjusted relative risk (95% confidence interval); . Other, non-Hispanic race/ethnicity includes Asian, Hawaiian/other Pacific Islander, Native American, and multiple races.
