Table 1—

Characteristics of overall cohort (n = 2,065) and comparing highest (>97%, n = 516) with lowest (<66%, n = 517) quartiles of baseline medication adherence

Total cohortHighest quartileLowest quartileP
Age (years)55.4 ± 12.257.5 ± 11.854.1 ± 12.6<0.001
Women (%)47.552.551.50.73
Race (%)
    White48.656.139.5
    Black18.513.223.8<0.001
    Other or unknown32.930.736.7
Census tract income39,674 (15,921)40,470 (15,966)39,835 (18,517)0.57
Clinic visits, prior year4.5 (6.2)4.5 (4.2)4.6 (4.2)0.62
BMI (kg/m2)33.0 (7.2)33.6 (6.8)32.3 (7.1)0.006
Concurrent medications7.8 (7.7)7.9 (7.7)8.3 (8.2)0.45
Total enrollment time (months)108 (19)107 (18)107 (19)0.98
A1C level preceding first medication initiation (%)9.4 (2.2)9.7 (2.1)9.3 (2.3)0.003
Time to initiation (months)1.5 (4.6)1.3 (4.8)1.8 (4.7)0.09
Time to next elevated A1C (months)15.0 (13.4)11.9 (11.8)15.0 (12.7)<0.001
  • Data are means ± SD, median (interquartile range), or n (%) unless otherwise indicated. Highest and lowest quartiles are of adherence to first prescribed hypoglycemic medication. P values are for highest vs. lowest quartile comparisons.