Table 2

Change in A1C, self-efficacy, and satisfaction by study group from baseline

VUMC
UNC
Combined
InterventionControlP*InterventionControlP*InterventionControlP*
Change in A1C
    Baseline to 3 months−1.60 (−2.07 to −1.00)−1.00 (−1.81 to −0.40)0.121−1.40 (−1.75 to −0.75)−0.30 (−1.06 to −0.10)0.014−1.50 (−1.80 to −1.02)−0.80 (−1.10 to −0.30)0.005§
    Baseline to 6 months−1.15 (−1.43 to −0.77)−1.20 (−2.22 to −0.70)0.657−0.75 (−1.40 to −0.20)−0.55 (−1.30 to −0.29)0.732−1.05 (−1.30 to −0.70)−0.90 (−1.30 to −0.53)1.0
Change in self-efficacy (PDSMS)
    Baseline to 6 months+8.0 (3.0 to 8.5)+4.0 (1.0 to 7.2)0.324+5.0 (2.0 to 6.0)+1.0 (−1.7 to 2.7)0.030+5.0 (3.0 to 7.0)+2.0 (1.0 to 4.0)0.018
Change in satisfaction (DTSQ)
    Baseline to 6 months+2.0 (1.0 to 5.0)+3.0 (2.0 to 6.4)0.584+2.0 (0.4 to 3.0)+0.5 (0.0 to 1.7)0.474+2.0 (1.0 to 3.0)+2.0 (1.0 to 3.0)0.836
  • Data are median (95% CI).

  • *P value determined by Wilcoxon rank-sum test comparing intervention and control.

  • P < 0.05 for paired comparison of 3- or 6-month value with baseline value using Wilcoxon signed-rank test.

  • P = 0.056 for comparison of intervention vs. control in a repeated-measures model using all available 3- and 6-month data, adjusted for age, sex, race, type of diabetes, income, baseline Diabetes Numeracy Test score, and baseline A1C level, including accounting for physician cluster and examination of an interaction term with time.

  • §P = 0.030 for comparison of intervention vs. control in a repeated-measures model using all available 3- and 6-month data, adjusted for age, sex, race, type of diabetes, income, baseline Diabetes Numeracy Test score, and baseline A1C level, including accounting for physician cluster and examination of an interaction term with time. DTSQ, Diabetes Treatment Satisfaction Questionnaire; PDSMS, Perceived Diabetes Self-Management Scale.