Table 1.
Sample characteristics
| Characteristic | N | Arithmetic Mean | Geo. Meanb | SD | Range | % |
|---|---|---|---|---|---|---|
| Maternal | ||||||
| Maternal age | 290 | 24.0 | 6 | 14.0 – 42.0 | ||
| Pre-pregnancy maternal weight (kg) | 241 | 59.1 | 10.4 | 41.0 – 108.0 | ||
| Maternal height (cm) | 218 | 154.3 | 4.9 | 143.7 – 170.8 | ||
| Parity | 289 | 1.9 | 1.8 | 0 – 9 | ||
| Smoking during pregnancy (% yes) | 282 | 84.8 | ||||
| Alcohol use during pregnancy (% yes) | 249 | 50.2 | ||||
| Occupational status (11 years) | 289 | |||||
| No occupation | 20.4 | |||||
| Unskilled laborers | 2.8 | |||||
| Semiskilled laborers | 22.4 | |||||
| Skilled craftswomen, clerks, saleswomen | 22.1 | |||||
| Technical jobs, small businesse | 11.4 | |||||
| Professionals | 20.0 | |||||
| Socioeconomic statusa | 290 | 28.4 | 11.7 | 8.0 –66.0 | ||
| Marital status (% married or living with someone) | 73,4% | |||||
| Newborn | ||||||
| Sex (% boys) | 290 | 49.7 | ||||
| Gestational age (weeks) | 290 | 39.2 | 1.5 | 35.0 – 44.0 | ||
| Birth weight (kg) | 288 | 3.50 | 0.45 | 2.50 – 4.74 | ||
| Length (cm) | 281 | 51.2 | 2.4 | 44.0 – 65.0 | ||
| Head circumference (cm) | 269 | 34.6 | 1.6 | 25.0 – 39.0 | ||
| Cord Hg (μg/L) | 278 | 21.8 | 16.11 | 17.5 | 1.0 – 99.3 | 100 d |
| Cord PCB 153 (μg/kg lipids) | 278 | 123.2 | 94.7 | 99.8 | 9.7 – 653.6 | 100 d |
| Cord lead (μg/dL) | 278 | 4.8 | 3.9 | 3.3 | 0.8 – 20.9 | 100 d |
| Breastfeeding (months) | 279 | 11.7 | 5.3 | 16.7 | 0.0 – 108.0 | |
| Children | ||||||
| Age (years) | 290 | 11.3 | 0.8 | 8.5 – 14.3 | ||
| Weight (kg) | 290 | 40.1 | 39.1 | 9.9 | 22.1 – 88.1 | |
| Height (cm) | 289 | 141.4 | 7.4 | 118.9 – 167.8 | ||
| BMI | 289 | 19.85 | 19.63 | 3.17 | 15.08 – 38.88 | |
| Head circumference (cm) | 289 | 54.7 | 54.7 | 1.6 | 50.5 – 60.8 | |
| Hg (μg/L) | 286 | 5.0 | 3.0 | 4.7 | 0.1 – 34.1 | 100 d |
| PCB 153 (μg/kg lipids) | 284 | 73.1 | 47.8 | 82.1 | 3.5 – 809.5 | 100 d |
| Lead (μg/dL) | 286 | 2.7 | 2.2 | 2.1 | 0.4 – 12.8 | 100 d |
| Food insecurity (% yes)c | 288 | 38.9 | ||||
a
Hollingshead index (1975) for the mean of the two principal caregivers of the children, based on occupational status and education;
b
Geometric mean is given for log-transformed variables;
c
Food insecurity refers to having experienced at least 1 day without food during the month prior to the interview.
d
Percent detected.