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Table 5 Sensitivity analysis of the studies that had 12 months data on glycated haemoglobin (changes from baseline to 12 months) with comparison for intervention (Int) and control (contr) groups and the heterogeneity (measured by I 2 ) of the analyses

From: Group based diabetes self-management education compared to routine treatment for people with type 2 diabetes mellitus. A systematic review with meta-analysis

Analysis number / Outcome Effect measure N studies N participants (Int/contr) Difference (95%CI) P-valueA Heterogeneity (I2)
5.1 Non-translated publications Mean Diff 10 630/630 -0.52 (-0.75 to -0.28) 0.000 41.0
5.2 Number of participants more than median of all studies with 12 months HbA1c data(104 total) Mean Diff 6 568/576 -0.67 (-0.86 to -0.48) 0.000 18.4
5.3 Studies with any part of results recalculated (HbA1c 12-14 months) Mean Diff 6 450/438 -0.54 (-0.78 to -0.31) 0.000 0.0
5.4 Study quality (Low risk of bias):glycated haemoglobin 12-14 months Mean Diff 2 192/187 -0.42 (-1.00 to 0.17) 0.163 77.4
5.5 Study quality (Moderate risk of bias) Mean Diff 7 428/436 -0.55 (-0.79 to -0.31) 0.000 29.7
5.6 Study quality (High risk of bias) Mean Diff 2 130/130 -0.95 (-1.55 to -0.35) 0.002 0.0
5.7 Study quality (Low & Moderate risk of bias) Mean Diff 9 620/623 -0.51 (-0.72 to -0.29) 0.000 41.3
5.8 Drop-out rate less than 10 % Mean Diff 5 444/454 -0.79 (-0.97 to -0.61) 0.000 0.0
  1. A. The P- value is calculated for the difference between the intervention and control group.