Table 3.
Birthrates by Age Group and Radioiodine Treatment Compared to National U.S. Birthrates
| No RAI | Yes RAI | ||||||
|---|---|---|---|---|---|---|---|
| Age group (years) | Women with WDTC (live births) | Live births per 1000 woman-years | Women with WDTC (live births) | Live births per 1000 woman-years | Unadjusted p value | Adjusted p valuea | 1999–2008 U.S. national birthrate (births per 1000 woman-years) (18) |
| 15–19 | 120 (24) | 44.8 | 218 (35) | 35.0 | 0.89 | 0.86 | 42.8±3.2 |
| 20–24 | 361 (106) | 64.7 | 483 (125) | 58.9 | 0.24 | 0.84 | 104.5±2.8 |
| 25–29 | 544 (145) | 57.9 | 756 (236) | 65.6 | 0.62 | 0.53 | 115.4±2.2 |
| 30–34 | 743 (136) | 39.3 | 1042 (212) | 42.1 | 0.49 | 0.14 | 95.0±4.3 |
| 35–39 | 977 (73) | 16.3 | 1222 (65) | 11.5 | <0.001 | <0.01 | 43.7±3.6 |
| 40+ | 6222 (11) | 0.4 | 6162 (11) | 0.4 | 0.68 | 0.69 | — |
a
Negative binomial regression, adjusted for tumor size, tumor stage, socioeconomic status (SES), marital status.
RAI, radioactive iodine; WDTC, well-differentiated thyroid cancer.