Table 3. Serum concentrations of thyroid hormones and their concentration associations between matched maternal and cord serum.
| FT3 (pmol/L) | FT4 (pmol/L) | T3 (nmol/L) | T4 (nmol/L) | TSH (μIU/mL) | |
|---|---|---|---|---|---|
| Maternal serum | |||||
| n | 123 | 156 | 155 | 157 | 157 |
| Mean ± SD | 3.79 ± 0.67 | 11.98 ± 2.03 | 2.57 ± 0.55 | 145.60 ± 35.82 | 3.32 ± 1.95 |
| Median | 3.82 | 11.89 | 2.54 | 140.00 | 3.03 |
| GM | 3.73 | 11.82 | 2.50 | 141.53 | 2.84 |
| Range | 1.76–5.41 | 7.45–17.49 | 0.77–3.86 | 71.42–288.30 | 0.26–12.77 |
| Cord serum | |||||
| n | 146 | 157 | 156 | 157 | 157 |
| Mean ± SD | 2.03 ± 0.52 | 15.94 ± 2.22 | 0.97 ± 0.36 | 129.52 ± 25.68 | 11.97 ± 8.66 |
| Median | 2.01 | 15.88 | 0.90 | 129.70 | 9.44 |
| GM | 1.98 | 15.78 | 0.93 | 126.98 | 9.86 |
| Range | 1.11–4.45 | 9.44–21.26 | 0.56–3.16 | 69.52–232.20 | 1.26–57.01 |
| Maternal–fetal correlationab | r = −0.139 | r = 0.083 | r = −0.026 | r = 0.260 | r = 0.001 |
| P = 0.142 | P = 0.303 | P = 0.751 | P = 0.001 | P = 0.993 | |
LOD, limit of detection; SD, standard deviation; GM, geometric mean. aExclude cases pairwise. bSince concentrations of FT3, FT4, T4 and TSH were normally distributed after log-transformed, Pearson correlation test was used to test the log-transformed concentrations for possible correlations. Spearman correlation test was used to test the correlations of non-normally distributed T3.