Table 2.

Risk of Kaposi sarcoma in relation to demographic characteristics, transplanted organ, and time since transplant

Characteristic	KS patients	Incidence rate, per 100,000 person-years	IRR (95% CI)1	p-value1
Total	163	12.4
Sex
Female	41	8.0	Ref.
Male	122	15.3	1.87 (1.32, 2.71)	< 0.001
Race
White	73	8.6	Ref.
Non-white	90	19.7	2.67 (1.92, 3.72)	< 0.001
Citizenship
United States citizen	147	11.7	Ref.
Non-United States citizen	16	30.1	2.10 (1.19, 3.47)	0.01
Age at transplant, years
15–34	14	5.7	Ref.
35–49	35	7.7	1.47 (0.80, 2.82)
50–64	83	16.4	3.26 (1.89, 6.04)
65+	31	28.6	6.24 (3.34, 12.25)	Ptrend < 0.001
Time since transplant, years
<1	81	35.1	Ref.
1 to <3	57	15.6	0.44 (0.31, 0.61)
3 to <5	13	5.0	0.13 (0.07, 0.23)
≥5	12	2.6	0.06 (0.03, 0.11)	Ptrend < 0.001
Transplanted organ
Kidney	91	11.7	Ref.
Liver	35	12.7	1.25 (0.83, 1.84)
Heart	22	16.2	1.40 (0.85, 2.23)
Lung	9	19.6	2.22 (1.03, 4.24)
Other or multiple	6	8.1	1.26 (0.49, 2.67)	0.23
Calendar year of transplant
1987–1996	54	14.2	Ref.
1997–2003	66	13.8	0.73 (0.51, 1.06)
2004–2014	43	9.6	0.26 (0.17, 0.39)	ptrend < 0.001

Abbreviations: KS, Kaposi sarcoma; IRR, incidence rate ratio; CI, confidence interval.

¹Adjusted for all factors (as categorized) in the table. P-trend based likelihood ratio tests treating ordinal categories as numeric in Poisson regression.