Table 3 Main characteristics of the study population: subjects representing the Taiwanese health screening program cohort, Taiwan

Age (years)

20–39

0

0

5

3

3

4

8

4

0.03^∥

40–49

1

2

33

18

11

16

43

22

50–59

13

27

46

25

18

26

44

22

60–69

13

27

33

18

21

31

48

24

 ≥ 70

22

44

67

36

16

23

55

28

Mean and sd

67·6

11·6

63·5

14·9

61·4

12·6

61·0

13·2

0·01^¶

Gender

Women

35

71

116

63

47

68

122

62

0.52^∥

Education

High school or below

16

33

34

19

14

21

39

20

0·28^∥

Some college

16

33

68

38

22

33

82

43

Bachelors and above

16

33

77

43

30

46

70

37

BMI^† (kg/m²)

 ≤ 24·9

35

72

109

59

32

46

53

27

 < 0·0001^∥

25·0–29·9

8

16

52

28

22

32

69

35

 ≥ 30·0

6

12

23

13

15

22

76

38

Mean andsd

24·0

5·9

25·1

5·2

26·3

5·2

29·5

6·6

 < 0·0001^¶

BP^‡ (range) (mmHg)

All

(n 49)

(n 184)

(n 69)

(n 198)

Systolic (83·0–199·0), mean andsd

123·5

21·6

123·2

20·8

124·4

19·5

127·9

18·2

0·11^¶

Diastolic (48·5–109·0), mean andsd

71·3

8·8

73·0

9·6

75·4

9·6

78·1

9·6

 < 0·0001^¶

Untreated

(n 44)

(n 139)

(n 50)

(n 141)

Systolic (83·0–184·5), mean andsd

123·0

22·4

119·3

19·1

121·1

19·1

126·1

17·3

0·03^¶

Diastolic (48·5–109·0), mean andsd

70·9

9·1

72·6

19·1

74·2

8·6

78·3

9·7

 < 0·0001^¶

Treated

(n 5)

(n 45)

(n 19)

(n 57)

Systolic (90·3–199·0), mean andsd

127·6

12·1

135·4

21·3

132·9

18·2

132·4

19·8

0·80^¶

Diastolic (54·5–100·5), mean andsd

74·7

5·2

74·0

9·5

78·5

11·6

77·5

9·1

0·21^¶

BP medication

No

44

90

139

76

50

72

141

71

0·06^∥

Some

5

10

45

24

19

25

57

29

Women 

3

60

26

58

12

63

32

56

0·96^∥

Men 

2

40

19

42

7

37

25

44

Duration of membership^§

 < 25 years

6

13

14

8

11

16

39

21

0·0044^∥

25–50 years

10

21

51

29

27

40

63

33

50–75 years

23

49

92

51

24

36

70

37

 ≥ 75 years

8

17

22

12

5

8

16

9