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Table 3 Racial differences in average adherence to oral antidiabetic medication over a 24-month follow-up period

From: Racial differences in long-term adherence to oral antidiabetic drug therapy: a longitudinal cohort study

  Sulfonylurea (n = 1256) Metformin (n = 148)
Time Since First Prescription Incidence Rate Ratio 95% Confidence Interval Incidence Rate Ratio 95% Confidence Interval
Across All Quarters (Blacks vs. Whites) 0.96 0.89, 1.05 0.79 0.63, 0.99
Within Quarters (Blacks vs. Whites)     
   Quarter 1 1.00 0.92,1.09 0.78 0.80, 1.00
   Quarter 2 0.86 0.78, 0.96 0.86 0.65, 1.13
   Quarter 3 0.90 0.80, 1.00 0.92 0.69, 1.21
   Quarter 4 0.91 0.81, 1.02 0.72 0.49, 1.06
   Quarter 5 0.94 0.84, 1.05 0.63 0.41, 0.96
   Quarter 6 0.92 0.81, 1.03 0.83 0.59, 1.17
   Quarter 7 0.92 0.81, 1.05 0.69 0.45, 1.06
   Quarter 8 0.96 0.84, 1.04 0.59 0.35, 0.97
  1. Adjusted for age, gender, neighborhood socioeconomic status, body mass index, any HbA1c test, baseline glycemic level, number of MD visits, and number of comorbidities, health centers with disproportionately high numbers of black patients; Referent Group: initiation month of treatment group; All rates reflect both main effect of race and quarter effects.
  2. p < .05