Odds ratios for metabolic syndrome (IDF and NCEP ATP III Classification) according to age at menarche.

*p-values for trend with age at menarche as linear variable.Abbreviations: OR: odds ratio, CI: confidence interval.Model 1: results were adjusted for age (in years).Model 2: “Life-style model”: results were adjusted for age (in years), physical activity (less or more than one hour per week), current smoking (yes/no) and alcohol intake (less or equal and more than 20 g per day).Model 3: “reproductive model”: results were adjusted for age (in years), number of pregnancies (no pregnancy, 1–2 pregnancies, more than 2 pregnancies), ever use of oral contraceptives and ever use of hormone replacement therapy.Model 4: “complete model”: results were adjusted for all above mentioned factors (model 2 and 3).Model 5: results were adjusted for all the variables in model 4 plus recollected BMI at age 25 years.Model 6: results were adjusted for all the variables in model 4 plus the BMI change since age 25 years.