Table 1 Odds ratios and 95% CIs for gastric cancer risk according to basic characteristics of study subjects in a nested case-control study within the KMCC 19,688 enrolled cohort members.

Sex

   Male

1.0 (reference)

   Female

1.0 (0.6–1.7)

Age ^a

   ≤ 63 years old

1.0 (reference)

   > 63 years old

1.1 (0.7–1.7)

Follow up ^b

   ≤ 6 years for FU

1.0 (reference)

   > 6 years for FU

1.0 (0.6–1.6)

Education level

   without any schooling

1.0 (reference)

   schooling

1.2 (0.7–2.0)

H. pylori infection

   negative (-)

1.0 (reference)

   positive (+)

1.0 (0.5–2.0)

CagA

   negative (-)

1.0 (reference)

   positive (+)

1.3 (0.6–2.5)

VacA

   negative (-)

1.0 (reference)

   positive (+)

1.2 (0.7–1.9)

Drink status ^c

   Never drinkers

1.0 (reference)

   Ever drinkers

0.9 (0.6–1.5)

Smoking status

   Never smokers

1.0 (reference)

   Ex smokers

1.4 (0.8–2.6)

   Current smokers

1.8 (1.0–3.2)*

Cigarette per day

   Never smokers

1.0 (reference)

   20 ≤

1.4 (0.7–2.8)

   >20

3.9 (1.4–10.7)**

   unreported

1.5 (0.9–2.7)

Smoking duration (years)

   Never smokers

1.0 (reference)

   20 ≤

0.9 (0.3–2.6)

   >20

1.9 (1.1–3.5)*

   unreported

1.5 (0.8–2.8)

Pack-Year ^d

   Never smokers

1.0 (reference)

   20<

1.9 (0.6–5.8)

   20–40

1.1 (0.5–2.6)

   ≥ 41

2.3 (1.1–4.9)*

   unreported

1.6 (0.9–2.8)