表 4.

出生年代与较早绝经的关联分析

Association between birth cohorts and early menopause

Birth cohort	Adjusted AHR (95%CI)
	1951-1960	1961-1965	1966-1970	1971-1975
AHR, average hazard ratios.
Total	Reference	0.91 (0.88-0.94)	0.89 (0.86-0.91)	0.80 (0.75-0.84)
Region
Rural	Reference	0.90 (0.86-0.95)	0.84 (0.80-0.89)	0.71 (0.64-0.78)
Urban	Reference	0.92 (0.89-0.96)	0.91 (0.88-0.95)	0.85 (0.79-0.91)
Educational level
Primary school or below	Reference	0.96 (0.92-1.00)	0.87 (0.83-0.91)	0.81 (0.73-0.89)
Junior high school	Reference	0.92 (0.86-0.98)	0.94 (0.88-1.00)	0.86 (0.79-0.94)
Senior high school	Reference	0.81 (0.72-0.90)	0.86 (0.77-0.97)	0.87 (0.72-1.06)
College or above	Reference	0.90 (0.66-1.22)	1.07 (0.79-1.44)	1.14 (0.79-1.66)