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); ∗P < 0.05. Other, non-Hispanic race/ethnicity includes Asian, Hawaiian/other Pacific Islander, Native American, and multiple races.