FIGURE 1—

Treatment effect and change over time in (a) mean hemoglobin A1c, (b) mean low-density lipoprotein, and (c) systolic blood pressure: Informatics for Diabetes Education and Telemedicine (IDEATel) Study, NY, 2002–2007.

Note. Adjusted means were based on a nonlinear model for HbA1c and LDL and a linear model for SBP, and the best fitting covariance structure was used for each. Income group (IG) 3 (>$20 000) was the reference group for income (IG1 < $10 000; IG2 = $10 000–$20 000). Time was measured in months from baseline, but the figure shows annual points. To enhance readability, the plot symbols and error bars for the telemedicine group have been offset. Error bars represent 95% confidence intervals. For more information, see the Appendix (available as a supplement to the online version of this article at http://www.ajph.org).

^aContrast estimates for usual care vs telemedicine IG1 quadratic term, P = .003; exponential term, P = .001; IG2 quadratic term, P = .884; exponential term, P = .976; IG3 quadratic term, P = .156; exponential term, P = .523.

^bContrast estimates for usual care vs telemedicine IG1 exponential term. P = .035; IG2 exponential term, P = .369; IG3 exponential term, P = .155.

^cContrast estimates for usual care vs telemedicine term IG1, P = .019; IG2, P = .543; IG3, P = .686.