Means of thyroid–muscle, anterior pituitary–muscle, and thyroid–anterior pituitary signal intensity ratios against the corresponding postnatal age at examination grouped according to week
| Postnatal Age at Examination | Signal Intensity Ratio | |||
|---|---|---|---|---|
| Thyroid–Muscle | Anterior Pituitary–Muscle | Thyroid–Anterior Pituitary | ||
| Day | No | Mean (SD) | Mean (SD) | Mean (SD) |
| 0–6 | 20 | 2.03 (0.15) | 2.01 (0.30) | 1.03 (0.16) |
| 7–13 | 22 | 1.99 (0.13) | 2.00 (0.23) | 1.01 (0.12) |
| 14–20 | 26 | 1.88 (0.19) | 1.78 (0.29) | 1.07 (0.13) |
| 21–27 | 31 | 1.67 (0.25) | 1.65 (0.17) | 1.02 (0.14) |
| 28–34 | 20 | 1.54 (0.19) | 1.50 (0.19) | 1.03 (0.11) |
| 35–41 | 9 | 1.57 (0.18) | 1.60 (0.27) | 1.00 (0.17) |
| 42–48 | 12 | 1.38 (0.17) | 1.43 (0.20) | 0.98 (0.11) |
| 49–55 | 13 | 1.34 (0.17) | 1.36 (0.21) | 1.00 (0.14) |
| 56–62 | 10 | 1.40 (0.22) | 1.36 (0.18) | 1.03 (0.12) |
| 63–69 | 2 | 1.25 (0.02) | 1.26 (0.18) | 1.02 (0.17) |
| 70–76 | 5 | 1.19 (0.10) | 1.16 (0.10) | 1.03 (0.10) |
| 77–83 | 3 | 1.13 (0.04) | 1.06 (0.02) | 1.06 (0.06) |
| 84–90 | 4 | 1.16 (0.05) | 1.12 (0.04) | 1.03 (0.06) |
| 91–97 | 2 | 1.10 (0.20) | 1.13 (0.03) | 0.97 (0.15) |
| 98–104 | 2 | 1.09 (0.08) | 1.14 (0.12) | 0.96 (0.03) |
| 105–111 | 2 | 1.10 (0.01) | 1.14 (0.11) | 0.97 (0.10) |
| Total | 183 | |||