Fig. 5.
Forest plot to indicate outcome of periodontitis treatment on HbA1c levels after 3–4 months. The effect for the mean percentage difference as a result of periodontal treatment was −0.40% (95% CI 0.78%, −0.01%), n = 244, representing a statistically significant reduction in HbA1c (p = 0.04) as a result of the periodontal treatment. IV, inverse variance (from Simpson TC, Needleman I, Wild SH, Moles DR, Mills EJ Treatment of periodontal disease for glycaemic control in people with diabetes. Cochrane Database Syst Rev, 2010, Issue 5. Copyright Cochrane Collaboration, reproduced with permission)