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

Table 2

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

Male (malignant)	Donors	Nonblood donors	Donors vs. nonblood donors RR	P-trend
18–25	185	217	0.97 (0.83–1.32)
26–35	306	333	0.97 (0.81–1.21)
36–45	580	728	0.90 (0.88–1.31)
46–55	646	835	0.79 (0.58–0.89)^∗
>55	344	620	0.62 (0.49–0.77)^∗
Female (malignant)
18–25	233	260	0.95 (0.79–1.19)
26–35	319	381	0.88 (0.74–1.11)
36–45	757	837	0.91 (0.80–1.07)
46–55	569	698	0.85 (0.70–1.13)
>55	140	429	0.57 (0.43–0.94)^∗