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Table 2 knowledge regarding vitamin D stratified by case and control groups

From: Knowledge and attitudes about vitamin D, and behaviors related to vitamin D in adults with and without coronary heart disease in Saudi Arabia

Variables

Cases (n = 130)

Controls (n = 195)

P-value*

N

%

N

%

 

Have you ever heard/learnt about vitamin D?

 Yes

53

40.8

136

69.7

.001

 No

77

59.2

59

30.3

Where have you heard or learnt about vitamin D?

 Newspaper/Magazine

1

0.8

4

2.1

.001

 TV

2

1.5

8

4.1

 Doctor

28

21.5

42

21.5

 Friends/Relatives

16

12.3

45

23.1

 School/university

3

2.3

22

11.3

 Internet

3

2.3

7

3.6

 Other health professionals (dietician)

0

0

10

5.1

 I don’t know

77

59.2

57

29.2

Vitamin D helps which of the following health effects?

 Prevention of kidney disease

0

0

2

1

.003

 Healthy bones

41

31.5

99

50.8

 Prevention of cancer

3

2.3

2

1

 I don’t know

86

66.2

92

47.2

Where do you think the body gets vitamin D from?

 Diet

7

5.4

18

9.2

.001

 Sun exposure

38

29.2

98

50.8

 Supplements

3

2.3

5

2.6

 I don’t know

82

63.1

74

37.9

What type of food is a good source of vitamin D?

 Vegetables & fruits

3

2.3

28

14.4

.001

 Milk

5

3.8

19

9.7

 Fatty fish (salmon, sardines)

14

10.8

49

25.1

 Olive oil

0

0

3

1.5

 Eggs

8

6.2

14

7.2

 I don’t know

100

76.9

82

42.1

Knowledge total scorea

1.6 (± 2.2)

2.5 (± 1.8)

.001

  1. *P-value based on X2 -test
  2. aNumbers refer to mean and standard deviation for each group, P-value based on Mann-Whitney U test