Table 3.

Factors Associated with Participants’ Willingness to Donate a Kidney

Variable*	OR (95% CI)†		P Value‡
	Unadjusted	Adjusted
Age (per year)	0.99 (0.98–1.00)	0.99 (0.97–1.00)	0.115
Female sex	1.50 (1.08–2.07)	1.51 (1.06–2.17)	0.028
Income level§	0.93 (0.85–1.01)	0.84 (0.73–0.97)	0.016
Logarithmic increase in payment	1.12 (1.09–1.16)	1.16 (1.06–1.27)	0.001
Logarithmic increase in CKD risk	0.67 (0.62–0.73)	0.72 (0.62–0.82)	<0.001
Family recipient	9.12 (6.94–12.0)	8.11 (4.44–14.82)	<0.001
Payment-by-risk interaction	–	1.00 (0.96–1.03)	0.87
Payment-by-income interaction	–	1.01 (0.99–1.03)	0.49
Payment-by-recipient interaction	–	0.87 (0.82–0.92)	<0.001
Recipient-by-income interaction	–	1.26 (1.06–1.48)	0.007
Survey packet (1 vs. 2)	–	1.04 (0.74–1.47)	0.81
Survey period (2008 vs. 2009)	–	1.00 (0.66–1.53)	0.99

CKD = chronic kidney disease; OR = odds ratio.

^*Additional variables were evaluated but not selected for inclusion in the multivariable model because of their weak associations with willingness to donate: race, education, employment, having a family member with CKD, having a family member who received a transplant, and knowing an organ donor.

^†The magnitude of the ORs may overestimate the rate ratios because donation decisions were common. The adjusted ORs are adjusted for all variables in the table.

^‡Reported P values are from the full multivariable model.

^§Income is categorized into 6 increasing strata; the reference stratum reflects an annual household income ≤$20 000.