Figure 2From: Impact of instrument error on the estimated prevalence of overweight and obesity in population-based surveys 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.Back to article page