TABLE 3

Multivariate Models of the Association of Injection in Arm and Risk of a Confirmed Medically Attended Local Reaction

Adjusted for Age, Gender, and MCO Site(N = 233 614)Adjusted for Age, Gender, MCO Site, and BMI(N = 70 652)a
RR (95% CI)PRR (95% CI)P
Injection in arm1.78 (1.43–2.21)<.0012.31 (1.67–3.20)<.001
Male1.11 (0.98–1.26).091.04 (0.85–1.27).7
Age
    48–51 moReferentReferent
    52–56 mo0.94 (0.79–1.11).51.15 (0.83–1.59).4
    57–60 mo0.91 (0.77–1.09).31.17 (0.87–1.56).3
    61–83 mo0.75 (0.63–0.91).0030.89 (0.65–1.21).4
MCO site
    AReferentReferent
    B0.96 (0.71–1.28).80.52 (0.30–0.92).02
    C1.17 (0.86–1.60).30.69 (0.48–0.98).04
    D1.19 (0.69–2.04).50.70 (0.37–1.32).3
    E1.73 (1.28–2.33)<.0011.21 (0.81–1.80).4
    F1.37 (0.99–1.90).060.97 (0.61–1.54).9
    G1.37 (1.09–1.72).0070.77 (0.57–1.06).1
BMI
    9.7–14.2Variable not included in model0.99 (0.66–1.49)1.0
    14.3–16.8Referent
    16.9–29.31.84 (1.49–2.28)<.001
  • RR indicates relative risk.

  • a Among the subgroup with valid values for BMI.