Table 1.

Principal component analysis.

	Factor 1 Modifications	Factor 2 Missing knowledge	Factor 3 Forgetfulness
12 If you think you have side effects due to of the medications (such as tremors, nausea etc.), do you not take the medication for a while, i.e., take a break?	0.830
11 If you think you have side effects due to of the medications (such as tremors, nausea etc.), do you reduce the dose without consulting a doctor?	0.765
13 If you feel you have to take too many, do you stop taking those medications you consider to be less important than the others without consulting your doctor?	0.762
10 Do you take any wrong or other/unprescribed medications (such as those of your partner)?	0.709
9 Do you stop taking your medication if you sometimes feel worse after taking the medication?	0.698
17 Do you deliberately not take medications you do not consider important, but take the rest?	0.637
8 Do you stop taking your medication when you feel better?	0.613
2 Do you know the dosages of your medication?		0.887
1 Do you know the reason for taking your medication?		0.855
5 Do you know the names of medications you are taking?		0.805
3 Are you familiar with the timing for taking the medication?		0.775
15 If you forget or omit your medication, do you forget it at noon?			0.887
16 If you forget or omit your medication, do you forget it in the evening?			0.832
14 If you forget or omit your medication, do you forget it in the morning?			0.723
6 Do you forget to take your medication?			0.623