Table 1 Characteristics of all mother-child dyads,those with at least one prenatal mercury and one BASC-2 behavior data, and dyads not included in the analyses due to missing either mercury or behavior assessment data [no. (%)]
From: Very low-level prenatal mercury exposure and behaviors in children: the HOME Study
Variable | Women and singleton children (n = 389) | Women and singleton children with at least one mercury and behavior measurement (n = 320) | Dyads not included due to missing either mercury or behavior assessment data (n = 69) |
|---|---|---|---|
Maternal age at delivery | |||
≤ 30 years | 207 (53.2) | 162 (50.6) | 45 (65.2) |
> 30 years | 182 (46.8) | 158 (49.4) | 24 (34.8) |
Missing | 0 | 0 | 0 |
Maternal ethnicity | |||
White | 237 (61.7) | 206 (64.4) | 31 (48.4) |
Others | 147 (38.3) | 114 (35.6) | 33 (51.6) |
Missing | 5 | 0 | 5 |
Midpoint value of income category at baseline | |||
> $ 40,000 | 231 (60.2) | 200 (62.5) | 31 (48.4) |
≤ $ 40,000 | 153 (39.8) | 120 (37.5) | 33 (51.6) |
Missing | 5 | 0 | 5 |
Maternal education | |||
Completed Bachelor’s degree | 191 (49.7) | 170 (53.1) | 21 (32.8) |
Not completed Bachelor’s degree | 193 (50.3) | 150 (46.9) | 43 (67.2) |
Missing | 5 | 0 | 5 |
Maternal marital status at baseline | |||
Married or living with partner | 300 (78.1) | 249 (77.8) | 51 (79.7) |
Unmarried or living alone | 84 (21.9) | 71 (22.2) | 13 (20.3) |
Missing | 5 | 0 | 5 |
Child sex | |||
Male | 181 (46.5) | 145 (45.3) | 36 (52.2) |
Female | 208 (53.5) | 175 (54.7) | 33 (47.8) |
Missing | 0 | 0 | 0 |
HOME score (at 12 months) | |||
≥ 40 | 219 (65.6) | 204 (67.6) | 15 (46.9) |
< 40 | 115 (34.4) | 98 (32.4) | 17 (53.1) |
Missing | 55 | 18 | 37 |
Maternal depression (BDI-II) at 20 weeks | |||
Minimal depression (≤13) | 296 (77.7) | 254 (80.1) | 42 (65.6) |
Mild, moderate or severe depression (> 13) | 85 (22.3) | 63 (19.9) | 22 (34.4) |
Missing | 8 | 3 | 5 |
Fish intake | |||
Not at all | 57 (14.9) | 48 (15.0) | 9 (14.1) |
Less than once a month | 114 (29.8) | 94 (29.5) | 20 (31.2) |
1 to 3 times a month | 132 (34.4) | 108 (33.9) | 24 (37.5) |
More than once a week | 80 (20.9) | 69 (21.6) | 11 (17.2) |
Missing | 6 | 1 | 5 |