TABLE 2.

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

	WCC Adherence Over the First Year, aRR (95% CI)a	WCC Adherence Over the Second Year, aRR (95% CI)a
IOE	0.54 (0.39–0.74)*	0.77 (0.68–0.87)*
Child race
White	Reference	Reference
African American	0.79 (0.70–0.89)*	0.84 (0.77–0.92)*
Asian American	0.93 (0.85–1.02)	0.96 (0.87–1.06)
Other	0.88 (0.80–0.96)*	0.94 (0.89–0.99)
Unknown	1.02 (0.89–1.17)	1.01 (0.87–1.17)
Ethnicity
Non-Hispanic	Reference	Reference
Hispanic	1.10 (1.02–1.18)*	1.13 (1.09–1.18)*
Unknown	1.05 (0.89–1.22)	0.94 (0.82–1.08)
Insurance
Private	Reference	Reference
Medicaid	0.71 (0.65–0.78)*	0.77 (0.74–0.80)*
Other or unknown	0.88 (0.70–1.09)	0.82 (0.66–1.03)
Low birth wt <2500 g	0.85 (0.79–0.91)*	1.06 (1.00–1.12)*
Complex chronic condition	1.05 (0.98–1.13)	1.06 (1.02–1.11)*
Child sex
Female	Reference	Reference
Male	1.01 (0.99–1.03)	1.01 (0.98–1.03)
Area-level povertyb	0.99 (0.98–0.99)*	0.99 (0.99– <1.00)*
Metropolitan residence	0.97 (0.85–1.11)	1.02 (0.97–1.08)

Generalized linear models with a log link and Poisson distribution.

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

^bThe coefficient represents a change in the relative risk per 1% increase.

^*P < .05.