Procedure to determine correction values in the NCG-study. As part of the procedure to determine correction values in the NCG-study, the value of the stadiometer at each school (left) that corresponded to 120.0 cm of the reference length (right) was recorded. In practice, the folding rule was blacked out above and below 120 cm to avoid misunderstanding.
Biehl et al. BMC Public Health 2013 13:146 doi:10.1186/1471-2458-13-146