Table 2.

Degree of obesity and the adjusted risk for gastric cancer

	Gastric cancer	Duration (person-years)	Incidence rate (per 1,000 person-years)	aHR (95% CI)a)
BMI b)
< 18.5	314	602,029.76	0.52	1.152 (1.027–1.292)
18.5–23	4,634	6,769,453.49	0.68	1 (reference)
23–25	3,744	4,520,560.49	0.83	0.977 (0.935–1.020)
25–30	4,403	5,108,345.76	0.86	1.027 (0.985–1.072)
≥ 30	346	560,217.27	0.62	0.985 (0.881–1.100)
BMI
< 25	8,692	11,892,043.75	0.73	1 (reference)
≥ 25	4,749	5,668,563.03	0.84	1.031 (0.994–1.069)
WC, M/F (cm) b)
< 80/< 75	3,623	6,607,430.37	0.55	0.951 (0.906–0.998)
80–85/75–80	3,685	4,578,966.61	0.80	0.966 (0.922–1.013)
85–90/80–85	3,308	3,496,236.26	0.95	1 (reference)
90–95/85–90	1,832	1,821,759.93	1.01	0.997 (0.942–1.056)
95–100/90–95	693	708,149.86	0.98	0.997 (0.928–1.082)
≥ 105/≥ 100	300	348,063.75	0.86	1.004 (0.892–1.131)
WC, M/F (cm)
< 90/< 85	10,342	14,139,457.95	0.73	1 (reference)
≥ 90/≥ 85	3,099	3,421,148.83	0.91	1.008 (0.967–1.050)

aHR, adjusted hazard ratio; BMI, body mass index; CI, confidence interval; F, female; M, male; WC, waist circumference.

^a)Adjusted for age, sex, smoking (never, former, or current smoker), alcohol consumption (none, < 30 g/day, or ≥ 30 g/day), regular exercise, income (low, normal-high), diabetes, hypertension, and dyslipidemia,

^b)WC and BMI were from the last examination in the 5-year period.