Higher parity associated with higher risk of death from gastric cancer

Table 2 Association between parity and hazard ratio of death from gastric cancer over a 31-year follow-up period

Parity	No. of subjects	Follow-up person-years	No. of gastric cancer (per 100 000)	Age-adjusted HR (95% CI)	Multivariate-adjusted HR1 (95% CI)
1	157 207	4 020 271.75	128 (3.18)	1.00	1.00
2-3	1 000 977	26 036 992.42	848 (3.25)	1.23 (1.01-1.49)	1.24 (1.02-1.50)
4+	134 278	3 629 563.83	114 (3.14)	1.33 (1.02-1.73)	1.32 (1.01-1.72)
				P = 0.030 for linear trend	P = 0.035 for linear trend

¹Adjusted for age, marital status, years of schooling, and birth place. HR: Hazard ratio; CI: Confidence interval.