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Box 1 DNAm classification score generation using Maas et al. stepwise regression data

From: Epigenetic modelling of former, current and never smokers

For each individual in our DNAm data, a weighted score was obtained by multiplying the normalised methylation value at a given CpG by the effect size Maas et al. then summing these values:
  b1cpg1 + b2cpg2 + … + b13cpg13
where “cpg” is the normalised methylation value in our dataset and “b” is the effect size from Maas et al. Additional file 4: Table S3