Table 1.
Descriptive statistics of the study participants-mother and infant pairs (n = 55).
| Variables | Mean ± SD | Median | Range |
|---|---|---|---|
| Mothers | |||
| Age (years) | 29.5 ± 4.64 | 31.0 | 17.0–40.0 |
| Prepregnant BMI (kg/m2) | 22.5 ± 4.12 | 21.7 | 15.4–34.9 |
| Parity (number) | 1.91 ± 0.784 | 2.00 | 1.00–4.00 |
| Length of residence in the Kaoping area (years) | 22.2 ± 11.6 | 27.0 | 1.00–40.0 |
| Newborns | |||
| Demography | |||
| Gestational age (week) | 38.2 ± 1.47 | 38.0 | 32.0–40.0 |
| Weight (kg) | 3.09 ± 0.379 | 3.01 | 2.30–4.00 |
| Length (cm) | 49.1 ± 1.63 | 49.0 | 46.0–52.0 |
| Head circumference (cm) | 33.5 ± 1.19 | 33.0 | 30.5–36.0 |
| Chest circumference (cm) | 32.3 ± 1.41 | 32.0 | 29.5–35.0 |
| Hormones in cord blood | |||
| Cord blood T3 (ng/mL) | 0.385 ± 0.0973 | 0.390 | 0.250–0.600 |
| Cord blood T4 (μg/dL) | 8.74 ± 1.56 | 8.83 | 5.22–12.5 |
| Cord blood TSH (μIUg/mL) | 4.85 ± 2.34 | 4.14 | 1.83–11.6 |
| Cord blood FT3 (pg/mL) | 1.38 ± 0.191 | 1.40 | 1.00–1.69 |
| Cord blood FT4 (ng/dL) | 1.11 ± 0.120 | 1.13 | 0.840–1.48 |
| Cord blood IGF-1 (ng/mL) | 58.8 ± 28.1 | 52.3 | 11.4–118 |
| Neurodevelopment | |||
| Newborns | |||
| Apgar score at 1 min (score) | 8.66 ± 0.601 | 9.00 | 6.00–10.0 |
| Apgar score at 5 min (score) | 9.02 ± 0.212 | 9.00 | 7.00–10.0 |
| Infants (Bayley-III) | |||
| Cognitive scale (score) | 101 ± 10.3 | 100 | 85.0–125 |
| Language scale (score) | 100 ± 10.2 | 100 | 77.0–125 |
| Motor scale (score) | 97.9 ± 8.65 | 97.0 | 79.0–121 |
| Social-emotional scale (score) | 98.5 ± 18.2 | 100 | 55.0–140 |
| Adaptive behavior scale (score) | 98.6 ± 14.3 | 100 | 62.0–131 |
| Age at the time of testing (month) | 11.1 ± 1.01 | 11.0 | 8.00–12.0 |