. Author manuscript; available in PMC: 2019 Feb 5.

Published in final edited form as: Clin Transplant. 2018 Feb 5;32(2):10.1111/ctr.13184. doi: 10.1111/ctr.13184

Table 3. Multilevel modified Poisson regression model of LKD nonresponse rate.

Multilevel modified Poisson regression showed similar rates of nonresponse among LKDs of different sex (p=0.4) and age (p>0.9). Contact via text messaging produced lower rates of nonresponse than contact via email (p=0.007). Significantly higher nonresponse rates were associated with donors of African American race (p=0.001) and later follow-up time points.

	Incidence Rate Ratio of Nonresponse	P

Donor age, per year	_0.971.00_1.03	>0.9
Female sex	_0.290.68_1.59	0.4
African American race	_2.075.81_16.36	0.001
Text message	_0.110.28_0.71	0.007
Response over time
1 week	(reference)
1 month	_0.692.25_7.31	0.2
6 months	_1.063.25_9.97	0.04
1 years	_1.624.75_13.96	0.005
2 years	_1.624.75_13.96	0.005