Table II.
Results of analysis of variance (ANOVA) models for the association of demographic characteristics with hemoglobin levels. Separate models were developed for the multicenter database and NHANES datasets; parameter estimates (standard errors) are given for each level of demographic characteristic relative to its reference category.
| REDS-II 2007-2008 | NHANES 2005-2008 | |||
|---|---|---|---|---|
| Estimate (Standard Error) in g/dL | Estimate (Standard Error) in g/dL | |||
| Intercept* | 15.53 (0.01) | 15.73 (0.08) | ||
| Center | ||||
| A | — | N/A | ||
| B | -0.02 (0.01) | N/A | ||
| C | -0.58 (0.02) | N/A | ||
| D | -0.34 (0.01) | N/A | ||
| Female 18-19 | -1.92 (0.01) | -2.19 (0.12) | ||
| Male 18-19 | — | — | ||
| Male | Female | Male | Female | |
| 18-19 | — | — | — | — |
| 20-29 | -0.02 (0.02) | 0.03 (0.01) | 0.07 (0.09) | 0.09 (0.10) |
| 30-39 | -0.11 (0.02) | -0.02 (0.02) | -0.08 (0.09) | 0.05 (0.10) |
| 40-49 | -0.18 (0.02) | -0.06 (0.02) | -0.19 (0.09) | 0.10 (0.10) |
| 50-59 | -0.32 (0.02) | 0.06 (0.02) | -0.35 (0.09) | 0.49 (0.10) |
| 60-69 | -0.52 (0.04 | 0.10 (0.03) | -0.59 (0.10) | 0.38 (0.10) |
| 70-99 | -0.69 (0.09) | -0.09 (0.06) | -1.16 (0.10) | 0.01 (0.10) |
| Male | Female | Male | Female | |
| White | — | — | — | — |
| Black | -0.29 (0.03) | -0.48 (0.02) | -0.89 (0.05) | -1.03 (0.05) |
| Hispanic | -0.14 (0.03) | -0.15 (0.02) | 0.01 (0.05) | -0.40 (0.05) |
| Other | -0.07 (0.03) | -0.10 (0.02) | -0.12 (0.07) | -0.29 (0.07) |
*
Intercept represents estimated mean hemoglobin for reference categorization (i.e. White male 18-19 years old from center 21).