Table3.

Results of age-adjusted Weibull accelerated failure time (AFT) survival regression model to explore potential factors associated with age at natural menopause

Factors	Parametric survival	p Value
	regression coefficient (95% CI)
Age of menarche(years)	0.00 (− 0.01, 0.01)	0.951
Age at marriage	− 0.09 (− 0.43, 0.23)	0.524
Gravity	− 0.11 (− 0.46, 0.23)	0.506
Number of abortions	− 0.01 (− 0.02, 0.01)	0.405
Parity	0.00 (− 0.00, 0.01)	0.223
BMI
Underweight < 18.5	− 0.09 (− 0.27, − 0.01)	0.023*
Overweight/Obese > 25	− 0.03 (− 0.05, − 0.02)	0.000*
Normal 18.5–24.9	Ref	–
Having history of irregular(yes/no) menstrual cycle	0.03 (− 0.01, 0.06)	0.135
Smoking habitus
Daily	− 0.04 (− 0.10, 0.02)	0.205
Occasionally	0.00 (− 0.11, 0.13)	0.908
Never	–	–
OCs > 6 months (yes/no)	0.12 (0.07, 0.17)	0.001*

BMI; body mass index, OC; oral contraceptives

Weibull accelerated failure time survival regression model was run over 3560 non-menopause women who were followed to reach the event

*Significant level at < 0.05