3. FDA possible sources of bias.
| Use of stadiometer | Height evaluation by same trained blinded examiner | Height evaluation at the same time of the visit day | Repeated (≥ 3) measurements during the study period | Record of compliance | |
| Allen 1998 | Yes | NR | NR | Yes | Yes |
| Brand 2011 | Yes | NR | NR | Yes | Yes |
| Pedersen 2010 | Yes | NR | NR | No | No |
| Shapiro 1998 | NR | NR | NR | No | Yes |
| Skoner 2008 | Yes | Yes | Yes | Yes | Yes |
| Skoner 2011 | Yes | Yes | Yes | Yes | Yes |
| Sorkness 2007 | Yes | NR | NR | No | Yes |
| Vaessen‐Verberne 2010 | Yes | NR | NR | No | Yes |
| Verbern 1998 | Yes | NR | NR | Yes | Yes |
| Wasserman 2006 | Yes | NR | Yes | Yes | NR |