Age at menarche (y)
	<12	12–15	≥16
Model 1	2.054 (1.204–3.504)	1.000	1.109 (0.785–1.567)
Model 2	2.194 (1.292–3.727)	1.000	0.998 (0.695–1.432)
Model 3	1.919 (1.020–3.608)	1.000	0.975 (0.673–1.412)

Values are presented as odds ratio (95% confidence interval). Odds ratios for metabolic syndrome according to the age at menarche; multivariable logistic regression was used. Model 1: adjusted for current age; model 2: adjusted for marital status, household income, education level, smoking status, alcohol consumption, and physical activity, in addition to model 1; and model 3: adjusted for number of pregnancies, use of oral contraceptive, and duration of lactation, in addition to model 2.