Table 1.
Study subject demographics
| Age group | ♀ (mean, weeks ± SD; N) | ♂ (mean, weeks ± SD; N) |
|---|---|---|
| Young | 13.3 ± 0.5; 10 | 13.0 ± 0.0; 10 |
| Old | 84.1 ± 8.5; 13 | 82.1 ± 8.3; 10 |
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