Table 2.

New York City Metropolitan area donor-derived cell-free DNA levels in kidney transplant recipients

NYC Metropolitan	> 1%	0.5% to 1%	< 0.5%
No. weeks	21	21	21
Mean no. samples	4.9 (12.3%)	5.7 (14.4%)	29.1 (73.3%)
SD	2.9	5.7	14.5
Regression Slope	-4.97	-4.13	+0.93
K-S	0.16	0.19*	0.10

New York City Metropolitan donor-derived, cell-free DNA samples categorized as cohorts. Linear regression slopes (samples/week) for individual cohort number of samples versus time. Normality was assessed with Kolmogorov-Smirnov (K-S) (P > 0.05), and only the 0.5% to 1% cohort did not show normality, due to small sample size.

SD, standard deviation; NYC, New York City.

*P = 0.036.