TABLE 2—
2009 Pandemic Influenza A Vaccination Prevalence Among Pregnant Women in King County, Washington State, by Socioeconomic Status, Belief About Influenza Risk, and Practice Variables: 2009–2010
| Predictor Variable | % (95% CI) | Unadjusted Prevalence Ratio (95% CI) | Adjusted Prevalence Ratio (95% CI) |
| Race/ethnicity (n = 4139) | |||
| Non-Hispanic White | 77.0 (75.2, 78.7) | 1.00 (Ref) | 1.00 (Ref) |
| Hispanic | 80.7 (77.2, 83.7) | 1.05 (1.00, 1.10) | 1.02 (0.95, 1.09) |
| Non-Hispanic Black | 69.7 (64.4, 74.6) | 0.91 (0.84, 0.98) | 0.99 (0.93, 1.05) |
| Other | 79.4 (76.8, 81.8) | 1.03 (0.99, 1.07) | 1.01 (0.98, 1.04) |
| Maternal age, y (n = 4171) | |||
| < 20 (Ref) | 69.6 (61.1, 77.0) | 1.00 (Ref) | 1.00 (Ref) |
| 20–24 | 69.4 (65.3, 73.2) | 1.07 (1.00, 1.15) | 1.04 (0.98, 1.11) |
| 25–29 | 74.3 (71.5, 76.9) | 1.15 (1.08, 1.22) | 1.06 (1.00, 1.12) |
| 30–34 | 79.7 (77.5, 81.8) | 1.00 (0.88, 1.14) | 1.01 (0.91, 1.13) |
| ≥ 35 | 82.1 (79.8, 84.3) | 1.18 (1.11, 1.26) | 1.07 (1.01, 1.13) |
| Highest education level completed (n = 4151) | |||
| < college degree (Ref) | 73.8 (71.4, 76.0) | 1.00 (Ref) | 1.00 (Ref) |
| Undergraduate or graduate degree | 79.5 (78.0, 81.0) | 1.08 (1.04, 1.12) | 1.00 (0.96, 1.03) |
| Language (n = 4160) | |||
| English (Ref) | 79.0 (77.5, 80.4) | 1.00 (Ref) | 1.00 (Ref) |
| Spanish | 85.9 (82.0, 89.1) | 1.09 (1.04, 1.14) | 1.02 (0.95, 1.10) |
| Other | 68.7 (65.5, 71.8) | 0.87 (0.83, 0.91) | 0.93 (0.89, 0.97) |
| Health care coverage (n = 4152) | |||
| Private insurance | 80.4 (78.9, 81.8) | 1.12 (1.08, 1.17) | 1.02 (0.99, 1.06) |
| Other or no insurance (Ref) | 71.7 (69.2, 74.0) | 1.00 (Ref) | 1.00 (Ref) |
| Location of prenatal care (n = 3873) | |||
| Midwife only | 62.9 (57.6, 68.0) | 0.80 (0.73, 0.87) | 0.89 (0.83, 0.96) |
| Other provider (Ref) | 78.8 (77.5, 80.2) | 1.00 (Ref) | 1.00 (Ref) |
| Had vaccine recommended by provider (n = 4032) | |||
| No (Ref) | 29.6 (24.5, 35.2) | 1.00 (Ref) | 1.00 (Ref) |
| Yes | 81.5 (80.2, 82.7) | 2.76 (2.30, 3.31) | 2.10 (1.72, 2.58) |
| Provider had vaccine available (n = 3926) | |||
| No (Ref) | 71.7 (68.4, 74.8) | 1.00 (Ref) | 1.00 (Ref) |
| Yes | 81.6 (80.2, 82.9) | 1.14 (1.09, 1.19) | 1.14 (1.09, 1.19) |
| Belief about pH1N1 risk (n = 4161) | |||
| High risk | 85.4 (84.0, 86.6) | 1.39 (1.33, 1.45) | 1.27 (1.21, 1.33) |
| Not at high risk or does not know (Ref) | 61.6 (59.0, 64.2) | 1.00 (Ref) | 1.00 (Ref) |
Note. CI = confidence interval; pH1N1 = pandemic influenza A.