Diabetes Self-Management Education: Miles to Go

Table 4

Mean outcome A1c levels for control and intervention groups, by delay from end of intervention to time of test.

				Control		Intervention
Length of delay	N	No. of studies	No. of tests	A1c		A1c		Percent difference	t-value	Mean weighted d	Est. % below A1C 6.4	Control change in est. %	Intervention change in est. %	Impact Score
				M	SD	M	SD
No delay	8,729	39	43	7.92	1.45	7.42	1.29	6.29%	2.31*	0.29	21.46%	3.16%	10.58%	7.42
1–13 weeks	1,291	7	9	8.38	1.36	7.66	1.15	8.61%	1.65^†	0.12	13.66%	1.89%	7.38%	5.49
14–26 weeks	1,572	9	11	9.07	1.54	8.26	1.56	8.92%	1.83*	1.02	11.66%	1.08%	8.95%	7.87
51 weeks or more	2,215	8	11	8.13	1.30	7.65	1.47	5.82%	2.50*	0.32	19.76%	4.41%	11.63%	7.22

Note. ^∗𝑃 < 0.05. ^†𝑃 < 0.10. % Below A1c 6.4 is an estimate of the percentage of participants in the intervention groups who achieved an A1c level below 6.4. Change in est. % is the change in estimated percentage of participants from baseline to post-treatment. Difference in change in est. % is the difference between the control and intervention groups.