Fig. 1
From: Apparent latent structure within the UK Biobank sample has implications for epidemiological analysis

Within-UK ancestry predicts migration that confounds education: estimated educational attainment of the United Kingdom, when seen only through the ALSPAC cohort based in Bristol. Scores are 1: vocational, 2: CSEs, 3: O-levels, 4: A-levels, 5: degree. CSE Certificate of Secondary Education. The predicted mean education for each region is given, along with 95% confidence intervals estimated by bootstrap resampling of individuals. Each region is coloured by predicted mean education, where predicted mean = 2 is shaded in red and predicted mean = 5 is shaded in white. See Methods for details. ALSPAC Avon Longitudinal Study of Parents and Children