Mean (SD) levels of thyroid hormones in the two groups at 30, 35, and 40 weeks after conception
| Lower iodine | Higher iodine | |
| Total thyroxine (nmol/l) | ||
| 30 weeks | 102 (35) (n=59) | 105 (33) (n=60) |
| 35 weeks | 120 (24) (n=54) | 120 (31) (n=56) |
| 40 weeks | 126 (26) (n=56) | 124 (28) (n=57) |
| Total triiodothyronine (nmol/l) | ||
| 30 weeks | 1.47 (0.57) (n=57) | 1.49 (0.43) (n=58) |
| 35 weeks | 2.00 (0.40) (n=54) | 2.01 (0.38) (n=55) |
| 40 weeks | 2.59 (0.48) (n=56) | 2.70 (0.47) (n=54) |
| Free thyroxine (pmol/l) | ||
| 30 weeks | 18.1 (8.5) (n=43) | 17.0 (5.5) (n=52) |
| 35 weeks | 18.6 (7.2) (n=50) | 17.5 (4.7) (n=50) |
| 40 weeks | 15.4 (3.6) (n=55) | 15.0 (3.1) (n=52) |
| Thyrotrophin (mU/l) | ||
| 30 weeks | 2.16 (1.58) (n=58) | 1.86 (1.04) (n=59) |
| 35 weeks | 2.13 (1.58) (n=54) | 1.93 (0.91) (n=54) |
| 40 weeks | 2.36 (0.90) (n=55) | 2.44 (1.02) (n=56) |
No significant intergroup differences were observed.