Association between Blood Donation and Malignant and Benign Tumour Risk: A Population-Based Study of 3.4 Million Participants in China

Table 3

Overall and age-stratified benign tumour cases in blood donors versus nonblood donors among males and females.

Male (benign)	Donors	Nonblood donors	Donors vs. nonblood donors RR	P-trend
18–25	621	639	0.96 (0.88–1.09)
26–35	683	719	0.94 (0.90–1.06)
36–45	670	734	0.91 (0.87–1.04)
46–55	396	491	0.87 (0.82–1.11)
>55	227	338	0.69 (0.50–0.94)
Female (benign)
18–25	1757	1915	0.98 (0.95–1.09)
26–35	1316	1682	0.89 (0.76–1.08)
36–45	2365	2723	0.91 (0.82–1.06)
46–55	723	1087	0.78 (0.59–0.95)
>55	119	410	0.52 (0.36–0.81)