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.