Table 1

Patient characteristics of the Helicobacter pylori positive and negative groups

H. pylori negativeH. pylori positive
N3928837
Age53.2±6.855.1±6.4*
Sex (% male)63.461.5
Smoking start (years)17.5±3.817.6±4.0
Pack years40.2±18.640.1±19.1
BMI25.6±3.925.4±3.8
Race (% Caucasian)97.689.7
Height (m)1.721±0.0971.709±0.091**
Sustained quitters (at 5 years, % of total)53.656.0
Education (years)13.8±2.812.8±2.9‡
Median income (US$)34 678±11 34531 470 ±10 659‡
Ln (natural logarithm), CRP (mg/L)0.995±0.6891.063±0.714†
  • Continuous data are shown as mean±SD.

  • *p Value=2.4×10−15.

  • **p value=0.0015.

  • †p value=0.012.

  • ‡p value <0.00001.

  • BMI, body mass index; CRP, C reactive protein.