Table 1. Item Identification and Fictitious Ratings on relevance of 27-Item Scale by Experts.

Questionnaire Items from literature review [15], [17], [18], [20]–[23], [27],	Reference Number		Rating on Relevance* by Expert					Experts in Agreement	Item CVI
			1	2	3	4	5
Concern of Injection
Pain	[17], [18], [20]–[23], [27], [30], [32]–[35], [38]		✓	✓	-	✓	✓	4	80%
Cannot manage skill of injection	[17], [18], [20], [21], [23], [27], [30], [34], [35], [38]		✓	✓	✓	✓	✓	5	100%
Inconvenience	[17], [20], [21], [33], [35], [38]		✓	✓	✓	✓	✓	5	100%
Complication of injection (skin marking and others)	[20], [33]–[35], [38]		✓	✓	✓	✓	✓	5	100%
Afraid of injection	[20], [22], [32]–[34], [38]		✓	✓	✓	✓	✓	5	100%
Afraid of blood glucose monitoring	[30], [32]		✓	✓	✓	✓	✓	5	100%
Concern of cost
Financial cost	[17], [20], [22], [27], [30], [35]		✓	✓	✓	✓	✓	5	100%
Time (for regular injection)	[20], [21], [27], [32]–[35], [38], [39]		✓	✓	✓	✓	✓	5	100%
Concern of social/family
Affect social life	[18], [20], [23], [27], [30], [32]–[34], [38], [39]		✓	✓	✓	✓	✓	5	100%
Worry other people will know his/her problem	[17], [23], [30], [33]–[35], [39]		✓	✓	✓	✓	✓	5	100%
Feeling injection is embarrassing, afraid of being seen	[15], [17], [20], [27], [32]–[34]		✓	✓	✓	✓	✓	5	100%
Feels like drug addict	[32]		✓	✓	✓	✓	✓	5	100%
Lack of family support	[15], [34], [35], [38]		✓	✓	✓	✓	✓	5	100%
Lack of social support	[20], [21], [38]		✓	✓	✓	✓	✓	5	100%
Concern of the DM disease management
Lack of updated information about DM	[15], [22], [38]		✓	✓	✓	✓	✓	5	100%
Low trust to physician	[20], [30], [33]		✓	✓	✓	✓	✓	5	100%
Wish to try Traditional Chinese Medicine	[35]		✓	✓	✓	✓	✓	5	100%
Wish to try other method (life style or alternative medicine) to control DM	[20]		✓	✓	✓	✓	-	4	80%
Worry about dependence on the drug	[32], [35]		✓	✓	✓	✓	✓	5	100%
Insulin will worsen disease severity	[23], [32]–[35]		✓	✓	✓	✓	✓	5	100%
Do not believe insulin can help his/her disease (glucose control and prevent complication)	[17], [18], [20], [23], [30], [32], [34], [35], [39]		✓	✓	✓	✓	-	4	80%
Pills works better than insulin	[17], [32]		✓	✓	✓	✓	-	4	80%
Do not agree that his/her disease is severe	[17], [18], [20], [33]–[35], [38], [39]		✓	✓	✓	✓	✓	5	100%
Insulin injection means failure of treatment	[15], [21], [34], [39]		✓	✓	✓	✓	-	4	80%
Can’t pay close attention to my diet as insulin treatment requires	[20], [32]–[34]		✓	✓	✓	✓	✓	5	100%
Worry about hypoglycemia	[17], [18], [20], [21], [23], [27], [30], [32]–[34]		✓	✓	✓	✓	-	4	80%
Worry about weight gain	[22], [23], [34]		✓	✓	✓	✓	✓	5	100%
Average CVI									96%
Proportion relevant (%)		100		100	96	100	81