Figure 2.

Pattern of drop-out in supplementary sample. Numbers exclude northwest Germany, which did not have a population-based register of children with CP. The denominator for each percentage is the number of families in the level immediately above. Shaded boxes indicate the categories of non-response that were analysed.

Dickinson et al. BMC Research Notes 2012 5:300   doi:10.1186/1756-0500-5-300
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