Skip to main content

Table 2 Factors affecting the menstrual cycle irregularity of premenopausal women (KNHANES, 2010-2012)

From: Factors associated with menstrual cycle irregularity and menopause

 

Univariate logistic (n = 4788)

Multivariable (n = 4773)

Multivariable (n = 4388)

 

OR

95% CI

OR

95% CI

OR

95% CI

Age, years

 19 to < 30

1.00

  

1.00

  

1.00

  

 30 to <40

0.47

0.37

0.61

0.60

0.41

0.90

0.63

0.41

0.95

 ≥ 40

0.75

0.60

0.93

0.79

0.52

1.18

0.84

0.55

1.28

Residence

 Rural

1.00

        

 Urban

0.83

0.62

1.12

      

Household income, quartiles

 I

1.00

        

 II

0.84

0.63

1.12

      

 III

1.19

0.89

1.59

      

 IV

1.01

0.76

1.35

      

Marital status

 Married

1.00

  

1.00

  

1.00

  

 Not married

1.51

1.24

1.85

1.46

1.00

2.14

1.73

1.38

2.16

Educational level

 Elementary school and below

1.91

1.24

2.94

2.04

1.28

3.25

2.07

1.24

3.46

 Middle school

1.69

1.18

2.42

1.81

1.23

2.66

1.79

1.20

2.65

 High school

1.00

  

1.00

  

1.00

  

 University and above

0.63

0.50

0.79

0.65

0.51

0.82

0.60

0.47

0.76

Smoking status

 Non-smoker

1.00

        

 Ex-smoker

0.95

0.59

1.54

0.97

0.58

1.60

   

 Current smoker

1.40

1.01

1.94

1.11

0.79

1.56

   

Secondhand smoking

 None

1.00

        

 < 1 h

0.99

0.58

1.69

      

 ≥ 1 h

1.00

0.69

1.43

      

Cigarettes per day

 Non-smoker

1.00

        

 < 20 cigarettes

1.24

0.93

1.65

      

 ≥ 20 cigarettes

1.10

0.45

2.71

      

Age at smoking initiation

 Non-smoker

1.00

        

 < 20 years

1.35

0.93

1.97

      

 ≥ 20 years

1.10

0.74

1.64

      

Pack-year

 Non-smoker

1.00

        

 Above the median (2.5 pack-years)

1.45

1.01

2.10

      

 Below or equal to the median (2.5 pack-years)

1.04

0.67

1.61

      

Alcohol consumption

 None

1.00

        

 ≤ 1 time per month

1.13

0.83

1.54

      

 2–4 times a month

0.89

0.62

1.26

      

 2–3 times a week

0.94

0.60

1.46

      

 ≥ 4 times a week

1.58

0.78

3.20

      

Body mass index

 0 to < 18.5 kg/m2

1.06

0.73

1.55

0.92

0.62

1.36

   

 18.5 to < 23 kg/m2

1.00

  

1.00

     

 23 to < 25 kg/m2

1.09

0.82

1.43

1.11

0.84

1.49

   

 25 to < 30 kg/m2

1.58

1.23

2.04

1.56

1.19

2.03

   

 ≥ 30 kg/m2

2.14

1.42

3.23

1.81

1.17

2.79

   

Perceived stress

 Little

1.00

  

1.00

  

1.00

  

 A little

1.02

0.70

1.50

1.07

0.73

1.57

1.09

0.72

1.65

 Much

1.34

0.90

2.00

1.31

0.89

1.95

1.28

0.83

1.98

 Very much

1.83

1.12

3.01

1.73

1.05

2.86

1.74

1.02

2.99

Modifiable risk factor scorea

 0

      

1.00

  

 1

      

1.13

0.75

1.70

 2

      

1.30

0.83

2.05

 ≥ 3

      

1.61

1.03

2.52

  1. OR odds ratios, CI confidence interval
  2. aThe given scores were summed and categorized based on smoking status, obesity level, and drinking frequency. The given score of each variable was as follows: 0 point each for non-smokers, underweight to overweight (0 to < 25 BMI), and nondrinkers; 1 point each for ex-smokers, obesity I (25 to < 30), and 1–4 times per month alcohol consumption frequency; and 2 points each current smoker, obesity II (≥30 BMI), and ≥ 2 times a week alcohol consumption frequency