TABLE 4

Risk for Febrile Seizures After MMRV Compared to Separately Administered Same-Day MMR and Varicella Vaccines (2000–2008) During Different Postvaccination Risk Periods

Days After VaccinationAnalysis Incorporates Chart-Confirmation Rate?RR (95% CI)aPExcess Risk per 10 000 Doses (95% CI)
7–10No1.98 (1.43–2.73)<.00014.6 (2.8–5.9)
Yes2.04 (1.44–2.90)<.00014.3 (2.6–5.6)
0–42No1.42 (1.11–1.81).0056.7 (1.7–12.9)
Yes1.46 (1.11–1.92).0086.2 (2.0–9.5)
0–30No1.40 (1.06–1.85).0175.1 (0.8–10.8)
Yes1.44 (1.05–1.97).0234.7 (0.7–7.6)
  • a All analyses were adjusted for age, VSD site, and each year and respiratory season by using Poisson regression analysis.