Table 1.

Performance of a clinical decision rule where those with a 10% or greater 10-year cardiovascular risk are considered positive for CVD (ie, at a high enough risk to require treatment, such as with statins): Glaswegian women in SHHEC

	Truth
Clinical decision rule	CVD	No CVD	Total
Treat (risk ≥10%)	124 (62%)	584	708
Do not treat (risk <10%)	76	1517 (72%)	1593
Total	200	2101	2301

Risk was estimated from a logistic regression model, including age, systolic blood pressure, total and high-density lipoprotein-cholesterol, diabetes and smoking status.

Sensitivity (true positive frequency)=124/200=0.620% or 62.0%.

Specificity (true negative frequency)=1517/2101=0.722% or 72.2%.

Note: This ignores censoring and bias from self-testing.

CVD, cardiovascular disease; SHHEC, Scottish Heart Health Extended Cohort.