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Table 1 Baseline and follow-up characteristics of study sample

From: Do changes in traditional coronary heart disease risk factors over time explain the association between socio-economic status and coronary heart disease?

  Higher SES   Lower SES  
  Mean (SD) N Mean (SD) N
Baseline     
Age (years) 53.3 (5.6) 8824 55.2 (5.7) 3315
Male 44.9% 8824 40.7% 3315
Framingham risk score 5.8 (6.0) 8824 7.0 (6.6) 3315
Total cholesterol (mg/dL) 212.3 (40.1) 8824 216.4 (43.7) 3315
HDL cholesterol mg/dL) 52.7 (17.0) 8824 52.9 (17.2) 3315
Systolic blood pressure (mm Hg) 118.0 (16.9) 8824 125.2 (20.0) 3315
Current smoker 22.9% 8824 34.9% 3315
Anti-hypertensive medication 17.8% 8785 28.8% 3300
3-year follow-up     
Total cholesterol (mg/dL) 207.8 (37.8) 8451 211.0 (40.3) 2928
HDL cholesterol (mg/dL) 50.5 (16.8) 8424 50.3 (16.8) 2922
Systolic blood pressure (mm Hg) 119.2 (17.5) 8483 125.1 (20.2) 2945
Current smoker 19.8% 8467 29.6% 2932
Anti-hypertensive medication 20.4% 8457 31.9% 2928
6-year follow-up     
Total cholesterol (mg/dL) 206.6 (36.4) 7844 208.8 (39.4) 2500
HDL cholesterol (mg/dL) 53.1 (18.3) 7843 52.1 (17.8) 2500
Systolic blood pressure (mm Hg) 122.2 (17.8) 7869 128.7 (20.5) 2515
Current smoker 15.9% 7848 23.5% 2494
Anti-hypertensive medication 25.6% 7834 37.4% 2498
9-year follow-up     
Total cholesterol (mg/dL) 200.7 (35.9) 6974 202.1 (38.8) 1990
HDL cholesterol (mg/dL) 50.6 (16.6) 6974 49.4 (16.1) 1990
Systolic blood pressure (mm Hg) 125.3 (18.1) 6994 130.6 (19.5) 2001
Current smoker 13.0% 6969 19.5% 1991
Anti-hy2ertensive medication 30.5% 6965 42.3% 1988
  1. Notes: SES = socio-economic status; SD = standard deviation; HDL = high density lipoprotein.