. 2015 Oct 7;14:105. doi: 10.1186/s12937-015-0095-z
© Horan et al. 2015
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| Slope (mm) | Sample size (total) |
| 0.5 | 575 |
| 1 | 145 |
| 1.5 | 66 |
| 2 | 38 |