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Table 1 Characteristics of 2012 study subjects in relation to educational levela

From: Education and household income and carotid intima-media thickness in Japan: baseline data from the Aidai Cohort Study in Yawatahama, Uchiko, Seiyo, and Ainan

Variables

Total (n = 2012)

Educationb

p for trendc

Low (n = 286)

Medium (n = 946)

High (n = 780)

Age, years

64.0 (55.0−69.0)

70.0 (66.0−73.0)

65.0 (58.0−69.0)

59.0 (50.0−66.0)

< 0.0001

Male gender

724 (36.0)

101 (35.3)

344 (36.4)

279 (35.8)

0.99

Smoking status

    

0.52

 Never

1381 (68.6)

200 (69.9)

650 (68.7)

531 (68.1)

 

 Former

489 (24.3)

66 (23.1)

233 (24.6)

190 (24.4)

 

 Current

142 (7.1)

20 (7.0)

63 (6.7)

59 (7.6)

 

Alcohol consumption

    

< 0.0001

 Never

864 (42.9)

154 (53.9)

415 (43.9)

295 (37.8)

 

 Former

127 (6.3)

16 (5.6)

66 (7.0)

45 (5.8)

 

 Current

1021 (50.8)

116 (40.6)

465 (49.2)

440 (56.4)

 

Leisure time physical activity

886 (44.0)

136 (47.6)

420 (44.4)

330 (42.3)

0.12

Hypertension

850 (42.3)

164 (57.3)

435 (46.0)

251 (32.2)

< 0.0001

Dyslipidemia

1049 (52.1)

155 (54.2)

509 (53.8)

385 (49.4)

0.07

Diabetes mellitus

157 (7.8)

28 (9.8)

81 (8.6)

48 (6.2)

0.02

Body mass index, kg/m2

23.0 (21.0−25.2)

23.7 (21.8−25.8)

22.9 (20.9−25.0)

22.7 (20.8−25.2)

0.002

Waist circumference, cm

82.5 (76.5−89.0)

84.1 (78.5−91.0)

82.5 (76.5−88.4)

82.0 (75.7−88.6)

0.0001

Employment

1165 (57.9)

110 (38.5)

512 (54.1)

543 (69.6)

< 0.0001

Maximum carotid intima-media thickness, mm

0.770 (0.693−0.885)

0.847 (0.731−0.962)

0.785 (0.693−0.885)

0.731 (0.654−0.847)

< 0.0001

Carotid wall thickening

261 (13.0)

59 (20.6)

130 (13.7)

72 (9.2)

< 0.0001

  1. aValues are medians (interquartile ranges) for continuous variables and numbers (percentages) of subjects for categorical variables
  2. bLow: junior high school; medium: high school; high: junior college, vocational technical school or university
  3. cFor continuous variables, a linear trend test was used; for categorical variables, a Mantel-Haenszel χ2-test was used