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Table 2 Mean HbA1c Improvements across groups, study length and quality in Randomised Control Trials

From: Systematic review of communication technologies to promote access and engagement of young people with diabetes into healthcare

Study Intervention group Mean Comparison group 1 Mean Comparison group 2 Mean Study length Quality score
  Before After Diff. Before After Diff. Before After Diff. Months (0-28)
Text messages            
Rami 2006 [39] 9.1 9.2 0.1 9.3 8.85 -0.45*     6 12
Franklin 2006 [42]‡‡ 10.0 9.2 -0.8* 10.1 10.3 0.2 9.8 10.1 0.3 12 19
Telephone support            
Howells 2002 [44] 8.4 8.7† 0.3 8.9 9.5† 0.6* 8.5 8.8* 0.3 12 22
Nunn 2006 [46] 8.15 8.85 0.7* 8.32 8.82 0.5* - -   7 20
Novel electronic communication            
Chase 2003 [40] 9.0 8.6 -0.4 8.9 8.6 -0.3 - -   6 15
Farmer 2005 [41] 9.2 8.6 -0.6* 9.3 8.9 -0.4* - -   9 25
Cadario 2007 [48] 9.5 8.8 -0.7* 9.1 9.1‡ 0 - -   18 15
Gay 2006 [43] 9.22 9.12 -0.1 9.17 9.27 0.1 - -   6 18
Marrero 1995 [45] 9.4 10 0.6* 9.9 10.3 0.4* - -   12 16
Rosenflack 1993 [47] ** 10.3 8.9 -1.4* 9.3 9.3 0 9.8 9.6 -0.2 12 15
  1. ‡‡ Significant difference between HbA1c levels for intervention group compared to comparison group 1 (p < .001)
  2. ‡ Comparison group was given intervention after 6 months due to the significant decline in HbA1c at 3 and 6 months compared to intervention group (p = .03)
  3. * Significant change between before and after HbA1c level (p < .05)
  4. ** Significant difference between groups at end of study (p < .01)
  5. † Approximation based on information provided in tables, true mean HbA1c (%) results not reported