Table 2.

Unadjusted Difference in Differences for Outcomes

	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.