Table 1.

Characteristics of the Study Population at Baseline, Overall and According to Provision of Informed Consent for Long-term Follow-up.^*

Characteristic	All Patients (N = 2502)	Consented (N = 1607)	Did Not Consent (N = 195)	Consent Not Attempted (N = 700)
Age (yr)	69.0±8.9	68.3±8.3	69.2±9.3	70.7±9.7
Assigned to stenting (%)	50.4	51.0	50.3	49.3
Male sex (%)	65.2	66.5	60.5	63.4
White race (%)†	93.2	94.5	91.8	90.7
Asymptomatic (%)	47.2	52.5	36.9	37.9
Risk factor (%)
Hypertension	85.9	84.7	86.1	88.7
Diabetes	30.5	28.8	36.6	32.8
Dyslipidemia	84.4	87.0	83.0	78.6
Current smoker	26.3	24.8	34.4	27.5
Prior cardiovascular disease or CABG	45.0	43.3	43.6	49.4
Severe stenosis (%)‡	86.0	86.8	83.6	84.9

^*Plus–minus values are means ±SD. There were no significant between-group differences in the characteristics at baseline, except for asymptomatic stenosis (P<0.001), diabetes (P = 0.02), and current smoking (P = 0.004). P values were calculated by the chi-square test, with the exception of a t-test for age, for the difference in the baseline rate between patients who consented and those who did not consent. CABG denotes coronary-artery bypass grafting.

^†Race was self-reported.

^‡Severe stenosis was defined as stenosis of at least 70% of the diameter of the artery.