Table 3: Construct validity of the Malay version of HBTS.

Items	Component (initial factor analysis)					Component(final factor analysis)b
	1	2	3	4	5	1	2	3
1 How often do you forget to take your blood pressure medicine?	0.701					0.653
14 How often do you miss taking your high blood pressure pills when you are careless?	0.691					0.725
10 How often do you skip your high blood pressure medicine before you go to the doctor?	0.654					0.676
8 How often do you forget to get your repeat medication?	0.548			0.475		0.536
2 How often do you decide NOT to take your blood pressure medicine?	0.547	0.425				0.536
12 How often do you miss taking your high blood pressure pills when you feel sick?		0.734					0.739
11 How often do you miss taking your high blood pressure pills when you feel better?		0.687					0.686
9 How often do you run out of high blood pressure pills?		0.629					0.595
5 How often do you eat fast food (KFC, McDonald, eat out)?			0.640					0.734
3 How often do you eat salty food?			0.562					0.565
4 How often do you add salt, ketchup or sauce on your food before you eat it?			0.480					0.562
7 How often do you miss your follow up appointments?			-0.516
13 How often do you take someone else’s high blood pressure pills?				0.828
6 How often do you make the next appointment beforeyou leave the clinic?a					0.790

Factor analysis. Extraction method: Principal component analysis. Rotation method: Promax with Kaiser normalisation. Component 1: medication adherence, component 2: medication adherence, component 3: salt intake

^aThis item needs reverse coding before analysis

^bFinal factor analysis excluding items 6,7 and 13