Table 1. Results of multiple logistic regressions examining demographic and attitudinal differences in preferences to donate biosample.

			p	Odds ratio	95% CI
Patients	Age	Age	<0.001	0.96	0.94–0.98
	Stigmatizing health conditions	Hepatitis B virus carriers(yes/no)	<0.001	0.22	0.09–0.48
	Do you trust medical institutions	Strongly trust	0.81	-	-
		Trust	0.76	-	-
		General	RE	-	-
		Mistrust	0.04	0.40	0.17–0.94
		Strongly mistrust	0.003	0.19	0.07–0.56
	Concerns*	Concern #1(yes/no)	0.03	2.00	1.06–3.76
		Concern #9(yes/no)	<0.001	14.19	3.96–50.81
General public	Geographic areas	Rural areas	<0.001	0.38	0.22–0.66
		Urban areas	RE
	Stigmatizing health conditions	Hepatitis B virus carriers(yes/no)	0.004	0.20	0.07–0.60
	Do you trust medical institutions	Strongly trust	0.07	-	-
		Trust	0.03	1.96	1.09–3.52
		General	RE	-	-
		Mistrust	0.88	-	-
		Strongly mistrust	0.96	-	-
	Concerns*	Concern #3(yes/no)	0.04	0.45	0.21–0.97
		Concern #5(yes/no)	0.04	0.40	0.17–0.97
		Concern #9(yes/no)	0.001	8.98	2.58–31.23

Demographic items were excluded from this table if none was statistically significant. Except age, all variables were entered into the models as categorical variables.

CI: Confidence Interval.

RE: Reference.

^*: Concern 1–9: 1: more tissue would be taken for research than was needed. 2: my confidentiality would be lost. 3: donations might be used in research that is dangerous to me or others. 4: donation might spread my disease. 5: donation might cause potential ethical issues. 6: I do not trust the intent of medical institutions. 7: I haven't thought about donation. 8: it's bad for my health. 9: no concern.