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Table 3 Results from the multivariate Cox regression analyses of premenstrual syndrome among national health screening examined participants (n = 104,574)

From: Premenstrual syndrome incidence rate and risk factors among the working population in the Republic of Korea: a prospective cohort study

 

Premenstrual syndrome, Hazard ratio (94% confidence interval)

Crude

Multivariable

Socioeconomic status

Age

 15–19

2.87 (2.45–3.37)

2.81 (2.35–3.36)

 20–29

2.00 (1.90–2.10)

1.95 (1.85–2.06)

 30–39

 

Reference

Household income level

 Low

1.28 (1.19–1.39)

1.01 (0.92–1.09)

 Moderate–low

1.40 (1.29–1.51)

1.02 (0.93–1.11)

 Moderate–high

1.36 (1.25–1.48)

1.08 (0.99–1.18)

 High

Reference

Reference

Occupational characteristics

Type of work

 Office

Reference

Reference

 Manual

1.09 (1.04–1.14)

1.06 (1.01–1.12)

 Other

0.90 (0.84–0.96)

0.89 (0.82–0.97)

Duration of work (month)

 < 6

1.09 (1.01–1.16)

1.06 (0.98–1.15)

 7–12

1.11 (1.06–1.17)

1.06 (1.00–1.13)

 > 12

Reference

Reference

Health status

Hypertension

 No

Reference

Reference

 Yes

0.71 (0.60–0.84)

0.89 (0.75–1.05)

Diabetes

 No

Reference

Reference

 Yes

0.67 (0.50–0.91)

0.86 (0.64–1.15)

Anemia

 No

Reference

Reference

 Yes

1.15 (1.09–1.22)

1.13 (1.06–1.20)

Body Mass Index

 Underweight (< 18.5)

1.31 (1.23–1.40)

1.21 (1.10–1.25)

 Normal weight (18.5–24.9)

Reference

Reference

 Overweight (≥ 25)

0.73 (0.67–0.80)

0.82 (0.75–0.89)

Health behavioral

Smoking

 Never or past

Reference

Reference

 Current

1.11 (1.01–1.25)

1.03 (0.90–1.15)

Drinking

 Non-severe

Reference

Reference

 Severe

0.99 (0.87–1.13)

1.02 (0.82–1.54)

  1. Bold indicated statistical significance