Table 4.

Longitudinal change in the adjusted relative incidence of living related kidney donation during the period 2005 and 2015 in women and men

Zip Code Level Income QuartilesWomen IRR (95% CI)Men IRR (95% CI)
Q1 (<$39,287)0.55 (0.45 to 0.68)a0.44 (0.37 to 0.51)a Q2 ($39,287–$49,120)0.65 (0.56 to 0.76)a0.43 (0.36 to 0.51)a Q3 ($49,121–$61,902)0.64 (0.57 to 0.73)a0.49 (0.41 to 0.60)a Q4 (>$61,902)0.78 (0.67 to 0.90)a0.69 (0.61 to 0.78)a
• IRR refers to the relative incidence of living kidney donation in 2015 relative to 2005, on the basis of a multilevel Poisson regression model adjusted for donor- and population-level age, race, ESRD rate standardized for race and age, and RUCA, clustered by state of residence. For example, women in the lowest income quintile (Q1) had a 45% decline in living related donation between 2005 and 2015, with an IRR of 0.55.

• a P<0.05.