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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