Table 2 Baseline (T1) characteristics for medical help-seeking during the follow-up period among T2 participants

Premenstrual syndrome (n, %)

 Moderate to severe

335 (14.2)

34 (28.1)

 < 0.001

2.36

1.56–3.58

 < 0.001

2.27

1.49–3.46

 < 0.001

Demographics (n, %)

 Age, ≥ 35 years old

1290 (54.5)

55 (45.5)

0.05

0.69

0.48–1.00

0.05

0.72

0.49–1.07

0.10

 Married

1153 (48.7)

62 (51.2)

0.59

1.11

0.77–1.59

0.59

 Having a child

946 (40.0)

39 (32.2)

0.09

0.71

0.48–1.05

0.09

0.75

0.49–1.16

0.19

 University education

1172 (49.5)

62 (51.2)

0.72

1.07

0.74–1.54

0.72

0.98

0.66–1.45

0.92

 Annual household income

  < 4 million JPY

644 (27.2)

23 (19.0)

0.11

Reference

Reference

  ≥ 4 and < 6 million JPY

530 (22.4)

24 (19.8)

1.27

0.71–2.27

0.43

1.43

0.79–2.58

0.24

  ≥ 6 million JPY

682 (28.8)

44 (36.4)

1.81

1.08–3.03

0.03

2.07

1.21–3.53

0.01

  Unknown

510 (21.6)

30 (24.8)

1.65

0.95–2.87

0.08

1.72

0.99–3.02

0.06

  Living in densely populated area^a

1362 (57.6)

75 (62.0)

0.34

1.20

0.83–1.75

0.34

1.15

0.78–1.70

0.48

Lifestyles (n, %)

 Current smokers

262 (11.1)

20 (16.5)

0.07

1.59

0.97–2.61

0.07

1.62

0.96–2.73

0.07

 Habitual drinkers

455 (19.2)

29 (24.0)

0.20

1.32

0.86–2.03

0.20

1.24

0.79–1.94

0.35

 Working hours ≥ 38 h/week

1181 (49.9)

64 (52.9)

0.52

1.12

0.78–1.62

0.52

1.00

0.68–1.47

0.99