TABLE 2

aRRs for WCC Adherence Over the First and the Second Year of Life

WCC Adherence Over the First Year, aRR (95% CI)aWCC Adherence Over the Second Year, aRR (95% CI)a
IOE0.54 (0.39–0.74)*0.77 (0.68–0.87)*
Child race
 WhiteReferenceReference
 African American0.79 (0.70–0.89)*0.84 (0.77–0.92)*
 Asian American0.93 (0.85–1.02)0.96 (0.87–1.06)
 Other0.88 (0.80–0.96)*0.94 (0.89–0.99)
 Unknown1.02 (0.89–1.17)1.01 (0.87–1.17)
Ethnicity
 Non-HispanicReferenceReference
 Hispanic1.10 (1.02–1.18)*1.13 (1.09–1.18)*
 Unknown1.05 (0.89–1.22)0.94 (0.82–1.08)
Insurance
 PrivateReferenceReference
 Medicaid0.71 (0.65–0.78)*0.77 (0.74–0.80)*
 Other or unknown0.88 (0.70–1.09)0.82 (0.66–1.03)
Low birth wt <2500 g0.85 (0.79–0.91)*1.06 (1.00–1.12)*
Complex chronic condition1.05 (0.98–1.13)1.06 (1.02–1.11)*
Child sex
 FemaleReferenceReference
 Male1.01 (0.99–1.03)1.01 (0.98–1.03)
Area-level povertyb0.99 (0.98–0.99)*0.99 (0.99– <1.00)*
Metropolitan residence0.97 (0.85–1.11)1.02 (0.97–1.08)
  • Generalized linear models with a log link and Poisson distribution.

  • a Adjusted for all variables listed in the table, year of birth as a fixed effect, and clustering by practice by using robust variance estimation.

  • b The coefficient represents a change in the relative risk per 1% increase.

  • * P < .05.