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Table 1 Content Validity Ratio (CVR) and Content Validity Index (CVI) of Items

From: Development and validation of dust exposure prevention questionnaire for cardiovascular patients based on the health belief model

Domain Item CVR CVI Final items
Perceived sensitivity 1. To what extent does dust in the air exacerbate CVDs? 0.9 0.8
2. To what extent does dust in the air exacerbate a heart attack? 1 1
3. To what extent does dust in the air trigger a heart attack? 0.9 0.8
4. To what extent does dust in the air increase the mortality rate of CVDs? 1 0.9
5. To what extent does dust in the air reduce the effectiveness of treatments? 0.9 0.9
Perceived barriers 6. It is difficult for me to use a mask during times of air pollution. 0.9 0.8
7. It is difficult for me to use a filtered mask during times of air pollution. 1 1
8. Staying home on dusty days is boring for me. 1 0.9
9. On dusty days, despite worsening symptoms, visiting a doctor or a medical center is difficult for me. 0.9 0.7
Perceived severity 10. Airborne dust can aggravate CVDs. 0.9 1
11. Existence of dust in the air can trigger dangerous heart attacks in CVDs. 0.8 0.9
12. Existence of dust in the air can increase the mortality rate of CVDs. 0.9 0.9
13. Existence of dust in the air can reduce the effectiveness of treatments. 1 0.8
Perceived benefits 14. Wearing a filter mask on high dust days can reduce the risk of complications. 1 0.8
15. Staying in the house on a very dusty day is good for maintaining health. 1 1
16. Immediate referral to a doctor can prevent heart problems if symptoms occur on dusty days. 0.9 0.9
17. Paying attention to air pollution announcements is beneficial to protect the health of the community. 0.7 0.9
Cues to action 18. My doctor advises me to use a mask when the air is dusty. 1 0.9
19. My doctor advises me not to go out of the house when the weather is dusty. 1 0.8
20. Health center staff advise me to use a mask in dusty weather. 0.9 1
21. Health center staff advise me not to go out of the house when the weather is dusty. 1 0.9
22. My family and friends advise me to use a mask when the weather is dusty. 1 1
23. My family and friends advise me not to go out of the house when the weather is dusty. 1 0.9
24. I pay attention to the mass media warnings about using a mask when the weather is dusty. 0.9 1
25. I pay attention to the mass media warnings about not going out of the house when the weather is dusty. 1 0.9
26. I have friends who inform me when the weather is dusty. 0.8 1
Self-efficacy 27. I can still wear a mask even when it is difficult to use in times of air pollution. 1 0.9
28. Even if I have work to do during times of air pollution, I can stay at home. 0.8 1
29. I am able to pay more attention to my symptoms when the air is heavily polluted. 0.9 0.7
30. On days when I can’t go out of the house due to air pollution, I can entertain myself at home. 1 0.8