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Editor's Correspondence |

A Counterargument to Encounter Frequency and Target Achievement: Measurement Variability

Andrew Hayen, MBiostat, PhD; Katy Bell, MBBCh, PhD; Paul Glasziou, FRACGP, PhD; Les Irwig, MBBCh, PhD
Arch Intern Med. 2012;172(4):374-375. doi:10.1001/archinternmed.2011.807.
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We offer an alternative explanation for the conclusion of the recent report by Morrison and colleagues1 that encounter frequency leads to apparent better control of glucose (hemoglobin A1c), blood pressure, and low-density lipoprotein cholesterol in patients with diabetes mellitus. While the authors have acknowledged that several forms of bias (including confounding) may affect their results, another important reason for the association between more frequent consultations and meeting targets is measurement variability. Each marker is subject to considerable random measurement variability.24 Because of random “highs,” those with more frequent measurements will more likely be mistakenly labeled as being uncontrolled. The exclusion of patients with “transient” highs partly mitigates this problem. Patients with borderline levels who have more frequent physician encounters are still more likely to be identified as uncontrolled compared with those with less frequent encounters.

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Correspondence

February 27, 2012
Fritha Morrison, MPH; Maria Shubina, ScD; Alexander Turchin, MD, MS
Arch Intern Med. 2012;172(4):374-375. doi:10.1001/archinternmed.2011.1414.
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