Table 3.
Hemoglobin A1C Test Results of Patients Before and After Mailed Letter Intervention
| Pre-intervention Phase | Post-intervention Phase | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adherenta | Non-adherent | Adherent | Non-adherent | |||||||||||
| Variable | Nb | Mean | SDc | N | Mean | SD |
P value |
N | Mean | SD | N | Mean | SD |
P value |
| A1C | ||||||||||||||
| A1C at Baseline | 31 | 9.2 | 1.2 | 14 | 8.6 | .50 | .03 | 23 | 8.9 | 1.0 | 22 | 9.0 | 1.2 | .72 |
| Difference Between Baseline A1C and Post-intervention A1C |
19 | -1.18 | 1.52 | 10 | -.19 | 1.89 | .10 | 7 | -1.44 | 1.38 | 22 | -.65 | 1.76 | .29 |
a
Adherence is defined as having received 2 consecutive A1C tests 3 calendar months apart.
b
N= number of patients.
c
SD=standard deviation.
Comparisons of adherence were made using the unpaired t test.