Table 2. Absolute and Cumulative Relative Risks of Hematologic Cancers After 1 Year, 5 Years, and 10 Years.

Hematologic cancer	Absolute risk, No. (%)		Relative risk (95% CI)	P value
	Pruritus	Controls
Hodgkin lymphoma, y
1	106 (0.032)	24 (0.007)	4.42 (2.83-6.88)	<.001
5	165 (0.050)	77 (0.024)	2.14 (1.64-2.81)	<.001
10	178 (0.054)	93 (0.028)	1.91 (1.49-2.46)	<.001
Lymphocytic leukemia, y
1	94 (0.029)	64 (0.020	1.47 (1.07-2.02)	.02
5	221 (0.067)	174 (0.053)	1.27 (1.04-1.55)	.02
10	269 (0.082)	208 (0.064)	1.29 (1.08-1.55)	.005
Monoclonal gammopathy, y
1	273 (0.083)	144 (0.044)	1.90 (1.55-2.32)	<.001
5	642 (0.196)	476 (0.145)	1.35 (1.20-2.52)	<.001
10	769 (0.235)	577 (0.176)	1.33 (1.20-1.48)	<.001
Multiple myeloma, y
1	100 (0.031)	42 (0.013)	2.38 (1.66-3.41)	<.001
5	241 (0.074)	165 (0.050)	1.46 (1.20-1.78)	<.001
10	293 (0.089)	208 (0.064)	1.41 (1.18-1.68)	<.001
Myelodysplastic syndrome, y
1	59 (0.018)	34 (0.010)	1.74 (1.14-2.64)	.009
5	177 (0.054)	128 (0.039)	1.38 (1.10-1.74)	.005
10	224 (0.068)	166 (0.051)	1.35 (1.10-1.64)	.003
Myeloid leukemia, y
1	105 (0.032)	41 (0.013)	2.56 (1.79-3.67)	<.001
5	262 (0.080)	151 (0.046)	1.74 (1.42-2.12)	<.001
10	330 (0.101)	193 (0.059)	1.71 (1.43-2.04)	<.001
Non-Hodgkin lymphoma, y
1	383 (0.117)	163 (0.050)	2.35 (1.96-2.82)	<.001
5	727 (0.222)	439 (0.134)	1.66 (1.47-1.86)	<.001
10	846 (0.258)	524 (0.160)	1.62 (1.45-1.80)	<.001
Polycythemia vera, y
1	114 (0.035)	95 (0.029)	1.20 (0.91-1.58)	.19
5	245 (0.075)	218 (0.067)	1.12 (0.94-1.35)	.21
10	289 (0.088)	256 (0.078)	1.13 (0.95-1.13)	.16
Waldenström macroglobulinemia, y
1	10 (0.003)	10 (0.003)	1.00 (0.42-2.40)	>.99
5	25 (0.008)	15 (0.005)	1.67 (0.88-3.16)	.11
10	31 (0.009)	19 (0.006)	1.63 (0.92-2.89)	.09