Table 1.
Umbilical Cord Serum Organochlorine Levels and Scores on 4 Subscales of the Conners’ Rating Scale for Teachers Among 8-Year-Old Children Born in New Bedford, Massachusetts, With Data on Both Exposure and Outcome Measures (n = 573), 1993–1998
| Mean (Standard Deviation) | Median | Range | Spearman Correlation Coefficient |
||||
| ΣPCB51a | ΣPCB4b | Toxic Equivalentc | p,p′-DDE | ||||
| ΣPCB51, ng/g serum | 0.57 (0.92) | 0.40 | 0.07–18.14 | 1 | 0.92 | 0.87 | 0.59 |
| ΣPCB4, ng/g serum | 0.26 (0.31) | 0.19 | 0.01–4.41 | 1 | 0.90 | 0.64 | |
| Toxic equivalent, pg/g lipid | 7.20 (11.73) | 4.45 | 0.00–151.49 | 1 | 0.57 | ||
| p,p′-DDE, ng/g serum | 0.50 (1.04) | 0.31 | 0.00–14.93 | 1 | |||
| Conners’ ADHD | DSM-IV Inattentive | DSM-IV Hyperactive | DSM-IV Total | ||||
| Conners’ ADHD Index | 53.19 (11.07) | 50 | 41–90 | 1 | 0.89 | 0.82 | 0.96 |
| DSM-IV Inattentive | 53.51 (10.74) | 50 | 40–90 | 1 | 0.63 | 0.94 | |
| DSM-IV Hyperactive-Impulsive | 51.74 (10.14) | 47 | 42–90 | 1 | 0.83 | ||
| DSM-IV Total | 53.04 (10.16) | 50 | 41–90 | 1 |
Abbreviations: ADHD, attention deficit hyperactivity disorder; p,p′-DDE, p,p′-dichlorodiphenyl dichloroethylene; DSM-IV, Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition; PCBs, polychlorinated biphenyls.
a
Sum of all measured PCB congeners.
b
Sum of PCB congeners 118, 138, 153, and 180.
c
Toxic equivalency factor-weighted sum of mono-ortho PCB congeners 105, 118, 156, 167, and 189, measured in pg/g lipid.