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Table 3 The methylation level in 31 pairs of GC cases

From: Methylation status of COX-2 in blood leukocyte DNA and risk of gastric cancer in a high-risk Chinese population

  Methylation proportion
Median % (interquartile range)
Self-control study
Pre-GC 2.5(1.4–4.4)
n = 31
Post-GC 1.5(0.9–2.8)
n = 31
P a 0.04
Temporal trend
1–4 years pre-GC 2.5(1.4–4.5)
n = 22
GC diag. year 1.5(0.7–2.7)
n = 21
P b 0.02
  1. a Conditional logistic regression analysis, adjusted for age
  2. b Mann–Whitney Test/Wilcoxon Test