Fig. 7From: Two-stage sampling in the estimation of growth parameters and percentile norms: sample weights versus auxiliary variable estimationCentile-curves for the Expressive Vocabulary test, based on the whole population (n=6,411). The bold curve in the middle depicts median centile values across age. The thin lines represent the 3rd, 10th, 25th, 75th, 90th and 97th centile-curvesBack to article page