Table 5
Linear regression results (coefficients (b), standard errors (SE), and p values) for log transformed urine mercury and creatinine corrected urine mercury concentrations in women aged 16–49 years for selected characteristics: United States, 1999–2000
| Characteristic | Log transformed urine mercury concentration | Log transformed creatinine corrected urine mercury | ||||||
|---|---|---|---|---|---|---|---|---|
| Unadjusted models | Multivariate model* | Unadjusted models | Multivariate model† | |||||
| b (SE) | p value | b (SE) | p value | b (SE) | p value | b (SE) | p value | |
| NA, not applicable. | ||||||||
| –, indicates that the covariate was not included in the model. | ||||||||
| *Model 1: most parsimonious model when dependent variable is log transformed urine mercury (μg/l). | ||||||||
| †Model 2: most parsimonious model when dependent variable is log transformed creatinine corrected urine mercury (μg/g). | ||||||||
| ‡Information for education and alcohol available only on 20–49 year olds. These covariates were not included in the multivariate regression analyses. | ||||||||
| §A smoker is defined as having a cotinine level of 10 ng/ml or higher. | ||||||||
| ¶Used as a continuous variable. Log transformed value for total blood mercury. | ||||||||
| Age | ||||||||
| 35–49 years | 0.21 (0.10) | 0.0464 | −0.43 (0.11) | 0.0003 | 0.64 (0.10) | 0.0000 | – | |
| 20–34 years | 0.18 (0.08) | 0.0290 | −0.15 (0.09) | 0.1129 | 0.33 (0.09) | 0.0005 | ||
| 16–19 years | Reference | Reference | Reference | |||||
| Race/ethnicity | ||||||||
| Non-Hispanic black | 0.42 (0.10) | 0.0001 | 0.48 (0.08) | 0.0000 | −0.10 (0.09) | 0.2607 | – | |
| Mexican American | 0.05 (0.10) | 0.6599 | 0.25 (0.06) | 0.0003 | −0.08 (0.12) | 0.4892 | ||
| Non-Hispanic white | Reference | Reference | Reference | |||||
| Pregnant | ||||||||
| Yes | 0.07 (0.14) | 0.6304 | – | 0.11 (0.10) | 0.2428 | – | ||
| No | Reference | Reference | ||||||
| Education‡ | ||||||||
| Did not complete high school | −0.12 (0.14) | 0.3932 | −0.32 (0.11) | 0.0071 | – | |||
| Completed high school | −0.16 (0.10) | 0.0955 | – | −0.22 (0.07) | 0.0022 | |||
| Some college | Reference | Reference | ||||||
| Cotinine smoking status§ | ||||||||
| Smoker | −0.33 (0.10) | 0.0020 | – | −0.41 (0.09) | 0.0000 | −0.20 (0.05) | 0.0004 | |
| Non-smoker | Reference | Reference | ||||||
| Had a dental visit past 12 months | ||||||||
| Yes | 0.12 (0.08) | 0.1263 | – | 0.27 (0.07) | 0.0005 | – | ||
| No | Reference | Reference | ||||||
| Fish and/or shellfish consumption in past 30 days | ||||||||
| Yes | 0.40 (0.09) | 0.0000 | – | 0.47 (0.08) | 0.0000 | – | ||
| No | Reference | Reference | ||||||
| Alcohol consumption‡ | ||||||||
| Moderate/heavy drinker | −0.07 (0.22) | 0.7299 | 0.14 (0.17) | 0.4051 | – | |||
| Light drinker | −0.18 (0.09) | 0.0577 | – | −0.07 (0.09) | 0.4326 | |||
| Abstainer | Reference | Reference | ||||||
| Total blood mercury concentration¶ | 0.35 (0.04) | 0.0000 | 0.30 (0.04) | 0.0000 | 0.41 (0.03) | 0.0000 | 0.35 (0.02) | 0.0000 |
| Number of amalgam surfaces§ | 0.06 (0.01) | 0.0000 | 0.07 (0.01) | 0.0000 | 0.07 (0.00) | 0.0000 | 0.06 (0.00) | 0.0000 |
| R2 | NA | 0.3183 | NA | 0.5204 | ||||
