TABLE 3.
Relative Risks (RRs) for Vaccine Series Completion Within 1 Year of Initiation: Vaccine Safety Datalink, 1996–2004
| Varicella Vaccine Recipients, RR (95% CI) | Hepatitis A Vaccine Recipients, RR (95% CI) | Hepatitis B Vaccine Recipients, RR (95% CI) | |
| Site | |||
| 1 | Reference | Reference | Reference |
| 2 | 0.86 (0.81, 0.92) | 1.03 (1.02, 1.04) | 1.17 (1.16, 1.18) |
| 3 | 0.69 (0.62, 0.76) | 1.19 (1.17, 1.22) | 1.12 (1.10, 1.13) |
| 4 | 0.80 (0.70, 0.91) | 0.88 (0.81, 0.94) | 1.41 (1.39, 1.43) |
| 5 | 0.87 (0.72, 1.05) | 0.89 (0.83, 0.95) | 1.34 (1.32, 1.36) |
| 6 | 1.08 (0.89, 1.32) | 1.19 (1.01, 1.40) | 1.74 (1.72, 1.77) |
| 7 | 0.46 (0.42, 0.50) | 1.06 (1.04, 1.07) | 1.08 (1.06, 1.09) |
| Age group, y | |||
| 2–4 | Reference | ||
| 5–8 | 0.78 (0.77, 0.79) | Reference | |
| 9–12 | 0.93 (0.92, 0.94) | 1.11 (1.10, 1.11) | |
| 13–17 | Reference | 0.77 (0.76, 0.78) | 0.82 (0.82, 0.83) |
| 18–29 | 1.06 (1.00, 1.12) | 0.51 (0.49, 0.52) | 0.75 (0.73, 0.76) |
| 30–49 | 1.19 (1.13, 1.25) | 0.74 (0.73, 0.75) | 1.00 (0.99, 1.01) |
| 50–64 | 0.91 (0.89, 0.92) | 1.10 (1.08, 1.11) | |
| ≥ 65 | 0.90 (0.89, 0.92) | 1.07 (1.05, 1.10) | |
| Male | 0.93 (0.90, 0.96) | 0.98 (0.97, 0.99) | 0.97 (0.96, 0.97) |
| Enrollment duration, y | |||
| 3–6 | Reference | Reference | Reference |
| 7–9 | 1.02 (0.97, 1.08) | 0.97 (0.96, 0.98) | 1.05 (1.04, 1.06) |
| 10–11 | 1.04 (0.98, 1.11) | 1.01 (1.00, 1.02) | 1.11 (1.10, 1.12) |
| ≥ 12 | 1.07 (1.01, 1.14) | 1.11 (1.09, 1.12) | 1.22 (1.21, 1.23) |
| Year of first dose | |||
| 1996 | Reference | Reference | Reference |
| 1997 | 0.88 (0.83, 0.93) | 1.13 (1.10, 1.17) | 1.04 (1.03, 1.04) |
| 1998 | 0.84 (0.79, 0.89) | 1.17 (1.14, 1.20) | 1.09 (1.08, 1.10) |
| 1999 | 0.83 (0.78, 0.88) | 1.21 (1.18, 1.25) | 1.08 (1.07, 1.09) |
| 2000 | 0.78 (0.73, 0.83) | 1.32 (1.29, 1.35) | 1.04 (1.03, 1.05) |
| 2001 | 0.77 (0.72, 0.83) | 1.32 (1.29, 1.35) | 1.08 (1.07, 1.09) |
| 2002 | 0.77 (0.72, 0.82) | 1.29 (1.26, 1.32) | 1.10 (1.09, 1.11) |
| Any chronic condition | 0.96 (0.90, 1.03) | 1.00 (0.99, 1.00) | 0.99 (0.98, 1.00) |
| No. of medical visits in year prior to dose 1 | |||
| 0 | Reference | Reference | Reference |
| 1–10 | 1.02 (0.98, 1.07) | 1.05 (1.04, 1.06) | 1.01 (1.00, 1.02) |
| > 10 | 1.04 (0.94, 1.14) | 1.15 (1.13, 1.16) | 1.05 (1.04, 1.06) |
Note. CI = confidence interval. RRs are estimated from multivariable models that adjust for all covariates. For varicella vaccine recipients, n = 16 075. For hepatitis A vaccine recipients, n = 594 917. For hepatitis B vaccine recipients, n = 590 445.