Table 1. Characteristics of Danish blood donors (174,523) vs. the general Danish population of non-donors (3,411,276).
Included individuals between 18 and 65 years of age in Denmark in 2010. All analyses were adjusted for age.
| Women | Men | |||||||
|---|---|---|---|---|---|---|---|---|
| Educational level | Non-donor | Donor | % | Adjusted RR (95% CI) | Non-donor | Donor | % | Adjusted RR (95% CI) |
| Primary and lower secondary education | 458,217 | 18,686 | 3.9 | 0.60 (0.59–0.62) | 486,212 | 16,812 | 3.3 | 0.48 (0.47–0.49) |
| High school | 112,433 | 10,156 | 8.3 | 1.19 (1.16–1.23) | 86,536 | 6,436 | 6.9 | 1.00 (0.97–1.03) |
| Vocational education | 483,167 | 29,790 | 5.8 | 1.03 (1.01–1.05) | 572,069 | 37,490 | 6.2 | 0.84 (0.82–0.85) |
| Higher education, short/middle length | 340,627 | 21,040 | 5.8 | Ref | 235,925 | 18,160 | 7.1 | Ref |
| Higher education, long | 85,271 | 4,749 | 5.3 | 0.89 (0.86–0.92) | 106,724 | 7,281 | 6.4 | 0.91 (0.89–0.94) |
| Unknown | 128,078 | 2,202 | 1.7 | 0.41 (0.39–0.44) | 141,494 | 1,721 | 1.2 | 0.32 (0.30–0.34) |
| Cohabitation status | ||||||||
| Living with parents | 88,517 | 4,573 | 4.9 | 0.88 (0.85–0.92) | 140,335 | 4,147 | 2.9 | 0.58 (0.56–0.60) |
| Single | 414,912 | 21,224 | 4.9 | 0.85 (0.83–0.86) | 408,733 | 16,708 | 3.9 | 0.69 (0.68–0.71) |
| Living with person of opposite gender | 1,026,922 | 56,621 | 5.2 | Ref | 960,826 | 63,724 | 6.2 | Ref |
| Living with person of same gender | 25,810 | 2,102 | 7.5 | 1.12 (1.07–1.18) | 42,304 | 1,389 | 3.2 | 0.59 (0.56–0.62) |
| Multi-household | 51,632 | 2,103 | 3.9 | 0.82 (0.79–0.86) | 76,762 | 1,932 | 2.5 | 0.62 (0.59–0.65) |
| Age of youngest child | ||||||||
| No children | 485,182 | 32,148 | 6.2 | Ref | 655,161 | 28,844 | 4.2 | Ref |
| 0 years old | 61,886 | 818 | 1.3 | 0.15 (0.14–0.16) | 57,061 | 4,114 | 6.7 | 1.06 (1.02–1.10) |
| 1–2 years old | 107,669 | 6,196 | 5.4 | 0.69 (0.67–0.72) | 104,308 | 6,790 | 6.1 | 0.98 (0.95–1.01) |
| 3–5 years old | 111,676 | 6,244 | 5.3 | 0.76 (0.74–0.79) | 108,807 | 6,399 | 5.6 | 0.96 (0.93–0.99) |
| 6–8 years old | 91,146 | 5,051 | 5.3 | 0.82 (0.79–0.84) | 88,694 | 5,349 | 5.7 | 1.05 (1.01–1.08) |
| 9–11 years old | 89,649 | 5,165 | 5.4 | 0.89 (0.86–0.92) | 86,751 | 5,299 | 5.8 | 1.09 (1.06–1.13) |
| 12+ years old | 660,585 | 31,001 | 4.5 | 1.00 (0.97–1.02) | 528,178 | 31,105 | 5.6 | 1.24 (1.21–1.28) |
| Urbanization level | ||||||||
| <25 person/km2 | 70,938 | 3,584 | 4.8 | 0.89 (0.86–0.93) | 80,928 | 3,686 | 4.4 | 0.76 (0.74–0.79) |
| 25–350 person/km2 | 229,112 | 11,336 | 4.7 | 0.87 (0.85–0.89) | 248,966 | 12,130 | 4.7 | 0.79 (0.78–0.81) |
| 350–1000 person/km2 | 281,821 | 14,785 | 5.0 | 0.92 (0.90–0.94) | 277,853 | 16,035 | 5.5 | 0.90 (0.88–0.92) |
| 1000–2000 person/km2 | 338,471 | 18,080 | 5.1 | 0.95 (0.94–0.97) | 328,800 | 19,545 | 5.6 | 0.97 (0.95–0.99) |
| 2000+ person/km2 | 658,770 | 37,635 | 5.0 | Ref | 656,309 | 35,184 | 5.1 | Ref |
| Unknown | 28,681 | 1,203 | 4.0 | 0.78 (0.74–0.83) | 36,104 | 1,320 | 3.5 | 0.77 (0.73–0.82) |
| Ethnicity | ||||||||
| Born in Denmark with a Danish parent | 1,380,148 | 83,303 | 5.7 | Ref | 1,403,748 | 84,818 | 5.7 | Ref |
| Born in Denmark with no-Danish parents | 19,299 | 456 | 2.3 | 0.39 (0.36–0.43) | 26,451 | 601 | 2.2 | 0.52 (0.48–0.56) |
| Born in a non-Western country | 146,197 | 1,032 | 0.7 | 0.17 (0.16–0.18) | 134,166 | 871 | 0.7 | 0.17 (0.15–0.18) |
| Born in another Western country | 57,140 | 1,692 | 2.9 | 0.71 (0.68–0.75) | 58,991 | 1,444 | 2.4 | 0.59 (0.56–0.62) |
| Unknown | 5,009 | 140 | 2.7 | 0.63 (0.54–0.75) | 5,604 | 166 | 2.9 | 0.64 (0.55–0.74) |