Table 1.
Characteristics of mothers and their infants (n = 747)
| Maternal and infant variables | values |
|---|---|
| Mothers | |
| Age (Mean ± SD, yr) | 27.4 ± 4.3 |
| Education | |
| Primary or less than primary (%) | 48.8 |
| Secondary (%) | 23.6 |
| High school or above (%) | 27.5 |
| Month income | |
| < 1000 yuan (%) | 9.4 |
| 1000–2999 yuan (%) | 57.6 |
| ≥ 3000 yuan (%) | 33.0 |
| Maternal occupation | |
| Unemployed/housewives | 43.1 |
| Agriculture | 22.9 |
| Manual | 8.9 |
| Sales and services | 3.2 |
| Professional/technical/managerial | 12.6 |
| others | 9.3 |
| Height(Mean ± SD) | 161.0 ± 4.2 |
| Weight(Mean ± SD) | 58.6 ± 8.8 |
| BMI(Mean ± SD) | 22.6 ± 3.2 |
| UIC (Median (IQR), μg/L) | 177.4 (116.1–267.8) |
| UIC < 50 μg/L (%) | 5.4 |
| UIC < 100 μg/L (%) | 19.0 |
| Infants | |
| Age (Mean ± SD, month) | 3.6 ± 1.8 |
| Male (%) | 57.8 |
| UIC (Median (IQR), μg/L) | 261.1 (172.7–366.1) |
| UIC < 50 μg/L (%) | 2.7 |
| UIC < 100 μg/L (%) | 7.8 |
| HAZ(Mean ± SD) | −0.008 ± 2.2 |
| WAZ(Mean ± SD) | 0.4 ± 1.6 |
SD standard deviation, IQR interquartile range, UIC urinary iodine concentration, HAZ height-for-age Z-score, WAZ weight-for-age Z-score, BMI body mass index