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Table 2 Average methylation and breast cancer risk in four studies

From: Epigenome-wide association study reveals decreased average methylation levels years before breast cancer diagnosis

Study Method Cases Controls Diff
   Mean (%) SD (%) IQR Mean (%) SD (%) IQR (%)
EPIC 450k 53.00 0.39 [52.68–53.27] 53.18 0.35 [52.97–53.40] −0.18
NOWAC 450k 54.02 0.45 [53.73–54.32] 54.02 0.41 [53.77–54.29] 0.00
MCCSa 450k 51.86 1.00 nd 51.95 1.01 nd −0.09
BGSb WGBS 48.12 48.30 −0.18
  1. nd not done (not reported)
  2. a[23]
  3. bFlanagan and Garcia-Closas, unpublished data