Table 2.

Unadjusted and adjusted analyses examining predictors of cost-related medication nonadherence (CRN).

PredictorsUnadjusted OR of CRN (95% CI)Adjusted OR of CRN (95% CI)
Comorbidity level (0 is reference)
  1–22.14 (1.80–2.55)2.20 (1.84–2.63)
  3+3.19 (2.62–3.88)3.12 (2.56–3.80)
  RA3.96 (2.99–5.25)3.52 (2.63–4.71)
Trend over time0.88 (0.85–0.90)0.89 (0.86–0.92)
Age0.96 (0.96–0.97)0.98 (0.97–0.98)
Female sex1.23 (1.16–1.30)1.32 (1.24–1.41)
Disabled3.31 (3.08–3.57)1.60 (1.41–1.83)
Income < US$25,0001.69 (1.58–1.81)1.23 (1.14–1.32)
Race (white is reference)
  Hispanic1.31 (1.16–1.48)0.91 (0.79–1.05)
  Black1.51 (1.37–1.66)1.09 (0.97–1.23)
  Other1.25 (1.02–1.54)1.12 (0.93–1.35)
Education (high school diploma reference)
  No high school diploma1.15 (1.06–1.26)1.08 (0.98–1.19)
  Above high school0.99 (0.92–1.06)1.13 (1.04–1.22)
Prescription coverage (none is reference)
  Partial0.91 (0.81–1.03)0.86 (0.75–0.99)
  Full private0.52 (0.47–0.57)0.57 (0.51–0.63)
  Full public0.82 (0.75–0.90)0.73 (0.65–0.83)
Fair/poor self-reported health status2.40 (2.26–2.55)1.55 (1.46–1.65)