Figure 2.

Relationship of the number of patient–student interactions (touchpoints) and change in hemoglobin A1c values between initial presentation to the Shade Tree Clinic (T-0) and 12 ± 3 months later (T-1). The data suggest a trend that more touchpoints correlate with more improvement in A1c values. Linear regression found a nonsignificant best-fit line relating the two variables (slope 0.97; 95% confidence interval −0.19 to 2.13; P = .10, r² = 0.06). The Y axis shows the change in A1c values from T-0 to T-1, with positive values indicating improvement (mean 1.7, standard deviation 2.3). The X axis shows the average number of touchpoints per month (mean 1.3, standard deviation 0.6). The dotted reference line indicates no change in A1c values; the solid black line, the best-fit line; and the gray areas, the 95% confidence interval.