Table 7 Hazard ratio (HR) of obesity according to the studied reproductive parameters (adjusted for birth cohorts) in the Cox proportional regression modelling (95 % CI, p = 0.020, omnibus test)

Menarcheal age

Early

0.285

2.687

Normal

0.279

0.867

Late^a

–

–

Cycle length in climacterium

Short

0.361

1.729

Average^a

–

–

Long

0.334

1.224

Bleeding length in climacterium

Short

0.134

0.836

Average^a

–

–

Long

0.461

1.719

Menstrual irregularity

No

0.205

4.083

Yes^a

–

–

Menopausal status

Premenopausal

0.117

1.346

Early perimenopausal

0.062

0.611

Late perimenopausal

0.122

0.952

Postmenopausal^a

–

–