Table 2.
Factors associated with a self-reported history of blood donation in the past 12 months (n=28,739).
| Characteristic | History of Blood Donation in the Past 12 Mo. | ||||||
|---|---|---|---|---|---|---|---|
| % (95% CI) * | Univariable Analysis | Multivariable Analysis | |||||
| PR (95% CI)† | P§ | aPR (95% CI)‡ | P§ | ||||
| Age group, years | |||||||
| 18–24 | 8.4 (7.2–9.7) | Ref. | - | Ref. | - | ||
| 25–29 | 6.1 (4.9–7.6) | 0.73 (0.56–0.95) | 0.021 | 0.67 (0.51–0.88) | 0.004 | ||
| 30–39 | 6.2 (5.4–7.1) | 0.74 (0.60–0.91) | 0.004 | 0.76 (0.60–0.97) | 0.025 | ||
| 40–49 | 5.6 (4.8–6.5) | 0.67 (0.55–0.83) | <0.001 | 0.70 (0.55–0.89) | 0.003 | ||
| 50–59 | 6.2 (5.4–7.1) | 0.74 (0.60–0.90) | 0.003 | 0.79 (0.63–1.00) | 0.048 | ||
| 60–69 | 5.2 (4.5–6.0) | 0.62 (0.50–0.76) | <0.001 | 0.74 (0.57–0.97) | 0.027 | ||
| ≥70 | 1.9 (1.4–2.5) | 0.23 (0.17–0.31) | <0.001 | 0.37 (0.25–0.52) | <0.001 | ||
| Sex | |||||||
| Female | 5.1 (4.7–5.6) | Ref. | - | Ref. | - | ||
| Male | 6.3 (5.7–6.9) | 1.22 (1.08–1.38) | 0.001 | 1.12 (0.99–1.27) | 0.077 | ||
| Race/ethnicity | |||||||
| Non-Hispanic white | 6.9 (6.4–7.4) | Ref. | - | Ref. | - | ||
| Non-Hispanic black | 3.9 (3.1–4.8) | 0.56 (0.45–0.70) | <0.001 | 0.60 (0.47–0.75) | <0.001 | ||
| Non-Hispanic Asian | 3.3 (2.4–4.6) | 0.48 (0.34–0.67) | <0.001 | 0.79 (0.55–1.14) | 0.210 | ||
| Hispanic | 3.0 (2.3–3.9) | 0.44 (0.34–0.57) | <0.001 | 0.63 (0.48–0.83) | 0.001 | ||
| Other/multiracial | 4.0 (2.1–7.6) | 0.58 (0.30–1.12) | 0.103 | 0.75 (0.39–1.45) | 0.395 | ||
| Birthplace | |||||||
| Foreign-born | 2.4 (1.9–3.0) | Ref. | - | Ref. | - | ||
| U.S.-born | 6.4 (6.0–6.9) | 2.67 (2.12–3.36) | <0.001 | 1.92 (1.49–2.47) | <0.001 | ||
| Census region | |||||||
| Northeast | 4.7 (3.9–5.7) | 0.64 (0.52–0.81) | <0.001 | 0.70 (0.56–0.87) | 0.001 | ||
| Midwest | 7.3 (6.5–8.3) | Ref. | - | Ref. | - | ||
| South | 6.0 (5.4–6.7) | 0.82 (0.70–0.97) | 0.017 | 0.98 (0.84–1.15) | 0.824 | ||
| West | 4.4 (3.8–5.2) | 0.61 (0.50–0.74) | <0.001 | 0.67 (0.55–0.82) | <0.001 | ||
| Educational attainment | |||||||
| Less than H.S. | 2.6 (1.9–3.5) | Ref. | - | Ref. | - | ||
| H.S. graduate or GED | 4.1 (3.5–4.8) | 1.58 (1.13–2.21) | 0.008 | 1.04 (0.74–1.47) | 0.804 | ||
| Some college | 6.6 (5.8–7.4) | 2.53 (1.83–3.51) | <0.001 | 1.34 (0.95–1.90) | 0.096 | ||
| College graduate | 7.0 (6.4–7.7) | 2.72 (1.99–3.70) | <0.001 | 1.42 (1.02–1.98) | 0.039 | ||
| Employment status in past 12 months | |||||||
| Unemployed | 2.8 (2.4–3.3) | Ref. | - | Ref. | - | ||
| Employed | 7.0 (6.5–7.5) | 2.52 (2.13–2.99) | <0.001 | 1.65 (1.35–2.02) | <0.001 | ||
| Annual family income, $ | |||||||
| <50,000 | 4.3 (3.9–4.8) | Ref. | - | Ref. | - | ||
| 50,000–99,999 | 6.2 (5.5–6.9) | 1.42 (1.21–1.65) | <0.001 | 1.06 (0.90–1.26) | 0.478 | ||
| ≥100,000 | 7.2 (6.4–8.0) | 1.65 (1.43–1.91) | <0.001 | 1.01 (0.84–1.21) | 0.932 | ||
| Marital status | |||||||
| Never married | 6.7 (5.9–7.6) | Ref. | - | Ref. | - | ||
| Married/living with partner | 5.7 (5.2–6.3) | 0.85 (0.74–0.99) | 0.035 | 0.99 (0.83–1.18) | 0.871 | ||
| Separated/divorced/widowed | 4.2 (3.6–4.8) | 0.62 (0.51–0.75) | <0.001 | 0.98 (0.79–1.22) | 0.887 | ||
| Sexual orientation | |||||||
| Straight | 5.7 (5.3–6.1) | Ref. | - | - | - | ||
| Gay/lesbian/bisexual | 6.1 (4.1–8.9) | 1.07 (0.73–1.57) | 0.734 | - | - | ||
| Other identity|| | 5.4 (2.7–10.6) | 0.95 (0.48–1.89) | 0.894 | - | - | ||
| Cigarette smoking status | |||||||
| Never | 6.2 (5.7–6.8) | Ref. | - | Ref. | - | ||
| Former | 5.1 (4.5–5.8) | 0.82 (0.71–0.95) | 0.010 | 0.88 (0.75–1.02) | 0.093 | ||
| Current | 4.4 (3.7–5.2) | 0.71 (0.59–0.85) | <0.001 | 0.73 (0.61–0.88) | 0.001 | ||
| Alcohol drinking status | |||||||
| Non-drinker | 4.1 (3.7–4.6) | Ref. | - | Ref. | - | ||
| Drinker | 7.0 (6.4–7.5) | 1.68 (1.47–1.92) | <0.001 | 1.17 (1.02–1.34) | 0.023 | ||
| Leisure time aerobic activity level | |||||||
| 0 minutes/week | 3.0 (2.5–3.5) | Ref. | - | Ref. | - | ||
| >0 and <150 minutes/week | 4.6 (4.0–5.4) | 1.55 (1.24–1.93) | <0.001 | 1.20 (0.96–1.51) | 0.113 | ||
| ≥ 150 and ≤ 300 minutes/week | 6.0 (5.2–7.0) | 2.02 (1.62–2.53) | <0.001 | 1.42 (1.13–1.78) | 0.003 | ||
| >300 minutes/week | 8.2 (7.5–8.9) | 2.74 (2.27–3.32) | <0.001 | 1.85 (1.51–2.25) | <0.001 | ||
*
Data are weighted row percentages and corresponding logit-transformed 95% confidence intervals (CI).
†
Prevalence ratios (PR) and corresponding 95% CIs were estimated by weighted log-binomial regression models.
§
P values were determined from design-adjusted Wald F-tests.
‡
Adjusted prevalence ratios (aPR) and corresponding 95% CIs were estimated from a weighted multivariable log-binomial regression model that included all covariates shown with the exception of sexual orientation.
||
Includes persons who reported “something else” and “I don’t know”.