Table 2.
Intervention Preperiod Mean | Intervention Pre–post Change | Control Preperiod Mean | Control Pre–post Change | Difference in Differences | |
---|---|---|---|---|---|
Observations | 613 | 613 | 557 | 557 | |
Mean systolic blood pressure (mmHg) | 138.4 | −2.4 | 139.3 | −2.0 | −0.4 |
Mean HbA1c* | 7.9 | −0.51 | 7.7 | −0.26 | −0.24 |
Log total chol/HDL† | 1.5 | −0.05 | 1.5 | −0.03 | −0.01 |
UKPDS 10-year risk | |||||
All patients | 30.7% | −2.6% | 31.0% | −0.8% | −1.8% |
Upper tercile UKPDS risk | 52.7% | −7.0% | 55.3% | −4.1% | −2.9% |
Lower tercile UKPDS risk | 18.5% | −0.1% | 19.6% | 0.8% | −0.9% |
Change difference (column 5) is obtained by subtracting column 4 from column 2. It represents the additional reduction after the intervention compared to the change in the control group.
Upper tercile group contains 225 intervention patients and 174 controls.
Lower terciles group contains 388 intervention patients and 383 controls.
*HbA1c is the glycosylated hemoglobin.
†Log total chol/HDL is the log of the ratio of total serum cholesterol divided by the high-density lipoprotein level.