Table 5:
Means (SDs) of observed Hg (ppm) and observed / imputed Hg values at each visit age in the SCDS Main Cohort, separately for boys and girls. Rows with a label of “(obs / imputed)” use the observed Hg value if available, and the imputed value otherwise. The p-values are from t-tests of whether the mean of each Hg variable differs by sex.
| Total |
Female |
Male |
||||
|---|---|---|---|---|---|---|
| n | n | Mean (SD) | n | Mean (SD) | p | |
| Maternal Hg | 746 | 369 | 6.94 (4.51) | 377 | 6.67 (4.49) | 0.42 |
| 6M Hg (observed) | 696 | 349 | 6.31 (4.02) | 347 | 6.92 (4.77) | 0.07 |
| 6M Hg (obs/imputed) | 770 | 383 | 6.28 (3.9) | 387 | 6.9 (4.58) | 0.04 |
| 19M Hg (observed) | 739 | 372 | 5.07 (3.25) | 367 | 4.54 (2.85) | 0.02 |
| 19M Hg (obs/imputed) | 770 | 383 | 5.12 (3.28) | 387 | 4.58 (2.84) | 0.02 |
| 66M Hg (observed) | 708 | 352 | 6.66 (3.25) | 356 | 6.34 (3.39) | 0.21 |
| 66M Hg (obs/imputed) | 770 | 383 | 6.59 (3.19) | 387 | 6.27 (3.34) | 0.17 |
| 9Y Hg (observed) | 537 | 348 | 5.93 (3.44) | 189 | 6.48 (3.78) | 0.1 |
| 9Y Hg (obs/imputed) | 742 | 375 | 5.91 (3.43) | 367 | 6.31 (3.73) | 0.13 |
| 17Y Hg (observed) | 564 | 311 | 7.28 (4.3) | 253 | 9.09 (4.92) | 0.00 |
| 17Y Hg (obs/imputed) | 677 | 345 | 7.16 (4.26) | 332 | 9.03 (4.85) | 0.00 |
| 19Y Hg (observed) | 481 | 273 | 8.65 (4.68) | 208 | 12.45 (6.94) | 0.00 |
| 19Y Hg (obs/imputed) | 677 | 345 | 8.59 (4.6) | 332 | 12.54 (6.47) | 0.00 |
| 22Y Hg (observed) | 567 | 311 | 4.03 (3.58) | 256 | 6.56 (4.05) | 0.00 |
| 22Y Hg (obs/imputed) | 677 | 345 | 3.91 (3.48) | 332 | 6.52 (3.9) | 0.00 |
| 24Y Hg (observed) | 576 | 313 | 3.81 (2.76) | 263 | 6.33 (4.23) | 0.00 |
| 24Y Hg (obs/imputed) | 677 | 345 | 3.77 (2.69) | 332 | 6.31 (4.13) | 0.00 |
| Childhood (6M-66M) TW metric | 770 | 383 | 5.48 (2.6) | 387 | 5.16 (2.47) | 0.08 |
| Early adulthood (17Y-24Y) TW metric | 677 | 345 | 5.62 (3.05) | 332 | 8.7 (4.08) | 0.00 |