Table 6

Subgroup analysis of relationship between antibody titre and gastric cancer by pepsinogen levels

AntigenNormal (PGI:PGII >3.0)Low (PGI:PGII <3.0)Interaction P
ORa95% CIPORa95% CIP
Dutch strains0.69(0.20–2.34)0.550.13(0.03–0.48)0.0020.05
French strains1.06(0.30–3.80)0.930.28(0.09–0.90)0.030.08
Venezuelan strains0.93(0.25–3.38)0.910.31(0.10–0.97)0.040.46
Commercial kit1.09(0.51–2.33)0.830.31(0.14–0.68)0.0030.02
CagA1.09(0.48–2.48)0.840.19(0.08–0.47)0.0030.002
  • a OR between top and bottom quartile groups (baseline = bottom) according to a trend model, controlling for age and sex.