NOTE: HbA1c = hemoglobin A1c; RSSM = resources and support for self-management. Means adjusted for site, age, gender, measurement order, RSSM, and interaction between measurement order and RSSM. Changes in HbA1c values over time differed significantly for patients with different RSSM values: RSSM × measurement order: Wald χ2(3) = 12.80, p = .005.