Table 2.
Logistic Regression of the Association Between Blood Transfusion and Cancer Prevalence
| Predictor | Estimate¶ | SE | Z | P-value | Odds Ratio | 95% Confidence Interval | |
|---|---|---|---|---|---|---|---|
| Lower | Upper | ||||||
| Blood transfusion (unadjusted) | |||||||
| No | Reference | ||||||
| Yes | 1.24 | 0.04 | 34.67 | < 0.001* | 3.47 | 3.23 | 3.72 |
| Blood transfusion (adjusted¥) | |||||||
| No | Reference | ||||||
| Yes | 0.62 | 0.04 | 15.91 | < 0.001* | 1.86 | 1.72 | 2.01 |
| Year of blood transfusion (unadjusted) | |||||||
| Before 1972 | Reference | ||||||
| 1972–1991 | −0.09 | 0.09 | −0.98 | 0.328 | 0.92 | 0.77 | 1.09 |
| 1992 to present | 0.22 | 0.08 | 2.78 | 0.005* | 1.25 | 1.07 | 1.45 |
| Year of blood transfusion (adjusted¥) | |||||||
| Before 1972 | Reference | ||||||
| 1972–1991 | 0.29 | 0.09 | 3.03 | 0.002* | 1.33 | 1.11 | 1.60 |
| 1992 to present | 0.49 | 0.08 | 5.73 | < 0.001* | 1.63 | 1.38 | 1.92 |
Notes: ¶Estimates represent the log odds of “Cancer = Yes” vs. “Cancer = No”; ¥Adjusted for age, gender, race, marital status, and education of the included patients; *Statistically significant.