Table 2.

Questionnaire Data on Active Blood Donors Aged 18–69 Years and Retired Blood Donors Aged 70 Years or Older

	Responders Aged ≥70 Years	Responders Aged 18–69 Years	RRa (99.8% CI), P
Total N	24 861	24 722
Women, n (%)	10 519 (42.3)	13 709 (55.5)
Symptoms and tests
Sick within the last 3 m	12.7 (12.1–13.4), 24 302	21.9 (21.0–22.7), 24 475	.70 (.66–.73), <.0001
Previous test for SARS-CoV-2	17.1 (15.1–19.3), 3080	35.8 (33.8–37.9), 5319	.51 (.45–.58), <.0001
Previous positive SARS-CoV-2 test	4.3 (1.9–8.0), 467	7.2 (5.5–9.3), 1839	.63 (.32–1.21), .02
Health behavior
Washing hands often	94.6 (94.1–95.0), 24 861	90.9 (90.4–91.5), 24 722	1.36 (1.27–1.45), <.0001
Using handkerchief	42.7 (41.7–43.7), 24 861	14.7 (14.0–15.4), 24 722	1.85 (1.80–1.90), <.0001
Sneezing in the elbow	77.0 (76.2–77.8), 24 861	81.2 (80.5–82.0), 24 722	.88 (.86–.91), <.0001
Avoiding handshake	93.5 (93.0–94.0), 24 861	91.7 (91.1–92.2), 24 722	1.15 (1.09–1.22), <.0001
Using facemask	1.8 (1.6–2.1), 24 861	1.8 (1.6–2.1), 24 722	.99 (.90–1.10), .85
Avoiding hugging people	83.8 (83.0–84.5), 24 861	83.7 (83.0–84.5), 24 722	1.00 (.96–1.04), .93
Reduced use of public transport	46.3 (45.4–47.3), 24 861	33.9 (32.9–34.8), 24 722	1.29 (1.25–1.33), <.0001
Avoiding crowded places	75.5 (74.7–76.4), 24 861	67.4 (66.4–68.3), 24 722	1.23 (1.19–1.27), <.0001
Staying home	41.3 (40.3–42.3), 24 861	31.5 (30.6–32.4), 24 722	1.23 (1.20–1.26), <.0001

Unless otherwise stated, the data are presented as percentage that responded yes (99.8% CI), n. If n is different from the total number it is because not all responded to this item.

Abbreviations: CI, confidence interval; RR, risk ratio; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

^aRR of difference in prevalence of symptoms or behavior between the 2 age groups, 99.8% CI, and P value.