Table 2.
Differences of blood lead concentration in different subgroups by adjusting demographic characteristics.
| Objects | Differences in blood lead concentration (μg/dl) | p -value |
|---|---|---|
| Age | ||
| ≤20 | Reference# | – |
| 21–40 | 0.55 | 1.96e−29 |
| 41–60 | 1.09 | 3.89e−47 |
| >60 | 1.38 | 8.60e−67 |
| Gender | ||
| Female | Reference$ | – |
| Male | 0.46 | < 2e−16 |
| Ethnicity | ||
| Non-Hispanic white | Referenceθ | – |
| Mexican American | 0.08 | 0.10449 |
| Non-Hispanic black | 0.16 | 9.27e−06 |
| Other Hispanic | −0.13 | 0.00173 |
| Other race—including multi-racial | 0.16 | 3.84e−05 |
| Education | ||
| Less than high school | ReferenceΦ | – |
| High school grad | −0.20 | 6.80e−11 |
| More than high school | −0.32 | < 2e−16 |
| PIR | ||
| 0.00–1.30 | ReferenceΨ | – |
| 1.30–3.50 | −0.18 | 3.42e−08 |
| >3.50 | −0.24 | 3.19e−09 |
After adjusting for sex, ethnicity, education level, and PIR, compared with the age ≤ 20 years group, the average blood lead concentration was 0.55 μg/dl higher in the 21–40 years group, 1.09 μg/dl higher in the 41–60 years group, and 1.38 μg/dl higher in the >60 years group.
After adjusting for age, ethnicity, education level, and PIR, the average blood lead concentration in male is 0.1 g higher than that in female.
After adjusting for age, sex, education level, and PIR, compared to Non-Hispanic white population, the average blood lead concentration was not significantly different in Mexican American population, 0.16 μg/dl higher in Non-Hispanic black population, 0.13 μg/dl lower in Other Hispanic population, and 0.16 μg/dl higher in other race.
After adjusting for age, sex, ethnicity, and PIR, compared to those whose educational level was less than high school, the mean blood lead concentration was reduced by 0.20 μg/dl in the high school grad group and 0.32 μg/dl in the more than high school group.
After adjusting for age, sex, ethnicity, and education level, compared with the PIR0.00–1.30 group, the average blood lead concentration in the PIR1.30–3.50 group decreased by 0.18 g, and the average blood lead concentration in the PIR >3.50 group decreased by 0.24 g.