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. Author manuscript; available in PMC: 2023 Sep 1.
Published in final edited form as: Neurotoxicology. 2022 Jul 19;92:49–60. doi: 10.1016/j.neuro.2022.07.003

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