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. 2008 Dec 15;6(1):A13.

Table 2.

Characteristics of the Study Sample and Distribution of Independent Variables by IHD Status at Baseline, Kuopio Ischemic Heart Disease Risk Factor Study, 1986-2001 (N = 621)

Variable Men Without IHD (n = 542) Men With IHD (n = 79) P valuea
Age and technical factors
Mean (SD) age at baseline, y 49.1 (5.9) 52.3 (5.5) .001
Mean (SD) log of maximum IMT at baseline, log mm −.013 (0.19) −.052 (0.25) .011
Sonographer at 11-year follow-up,b n (%)
  A 19 (3.5) 2 (2.5) .577
  B 6 (1.1) 0
  C 517 (95.4) 77 (97.5)
Participation in lipid-lowering drug trial, n (%)
  Placebo group 37 (6.8) 6 (7.6) .802
  Treatment group 34 (6.3) 6 (7.6) .655
Biological factors
Mean (SD) blood glucose level, mmol/Lc 4.9 (0.9) 4.9 (0.7) .808
Mean (SD) plasma fibrinogen level, g/Lc 3.0 (0.5) 3.1 (0.5) .025
Mean (SD) BMI at baseline, kg/m2 26.5 (3.2) 26.8 (3.3) .405
Mean (SD) LDL cholesterol at baseline, mmol/L 3.8 (0.9) 3.9 (1.0) .232
Mean (SD) HDL cholesterol at baseline, mmol/L 1.3 (0.3) 1.3 (0.3) .634
Mean (SD) SBP at baseline, mm Hg 131 (15) 127 (15) .017
Mean (SD) proportion of follow-up time taking lipid-lowering medication 0.01 (0.07) 0.04 (0.13) .061
Mean (SD) proportion of follow-up time taking blood pressure-lowering medication 0.17 (0.32) 0.33 (0.41) .002
Behavioral factors
Mean (SD) alcohol consumption, g/wkc 77.3 (996.6) 84.5 (110.1) .543
Smoking status, n (%)
  Nonsmoker 204 (37.6) 28 (35.4) .968
  Former smoker 157 (29.0) 23 (29.1)
  Irregular smoker 41 (7.6) 7 (8.9)
  Current smoker 149 (25.8) 21 (26.6)
Mean (SD) conditioning LTPA, h/yc 121 (103) 120 (93) .986
Mean (SD) cardiorespiratory fitness, mL O2/kg/min 34.3 (7.0) 28.4 (6.8) .001
Socioeconomic status
Mean (SD) annual income, 1,000 FIMc 12.0 (6.8) 9.2 (4.5) .001
Psychosocial job factors
Mean (SD) social support at work score 6.0 (2.3) 5.7 (2.4) .410
Mean (SD) mental strain at work index 11.8 (5.2) 13.4 (5.4) .014
Stress from work deadlines, n (%) 351 (64.8%) 33 (58.2%) .259
Work time
Mean (SD) days/week at baseline 5.2 (0.6) 5.3 (0.8) .161
Mean (SD) hours/day at baseline 8.0 (1.5) 8.1 (1.6) .438
Mean (SD) hours/week at baseline 41.9 (11.3) 43.5 (13.2) .201
Employment intensity between baseline and 11-year follow-up 0.70 (0.31) 0.51 (0.32) .001
Mean (SD) hours worked per year employed between baseline and 11-year follow-up 1,351 (708) 993 (711) .001

Abbreviations: IHD, ischemic heart disease; SD, standard deviation; IMT, intima-media thickness; BMI, body mass index; LDL, low-density lipoprotein; HDL, high-density lipoprotein; SBP, systolic blood pressure; LTPA, leisure-time physical activity; FIM, Finnish markka.

a

Calculated by using t tests or χ2 tests.

b

All ultrasound examinations were performed by the same sonographer at baseline.

c

Average of baseline, 4-year, and 11-year values.