Table 2 Multivariate linear regression for number of days of fibroid-related treatment in patients with uterine fibroid

CM

  Nonusers

17.2 ± 56.8

-

-

-

-

  Users

7.4 ± 24.3

-10.49

1.03

-19.03

<0.0001

Age, years

  <20

3.5 ± 15.1

-

-

-

-

  20-29

6.1 ± 27.3

4.22

14.49

1.29

0.1971

  30-39

11.0 ± 41.3

8.75

37.28

2.73

0.0063

  40-49

18.4 ± 58.3

15.41

45.19

4.82

<0.0001

  ≥50

15.0 ± 50.6

13.07

24.33

4.03

<0.0001

Income, US$ per month

  <520

14.7 ± 50.5

-

-

-

-

  520 - 639

13.9 ± 48.7

-1.22

1.57

-1.78

0.0745

  640- 759

17.1 ± 56.2

-0.36

1.94

-0.48

0.6300

  ≥760

12.8 ± 45.9

-2.46

1.67

-3.44

0.0006

Occupational status

  White collar

13.2 ± 47.3

-

-

-

-

  Blue collar

17.2 ± 56.4

1.70

1.48

2.70

0.007

  Others

15.1 ± 50.9

1.18

1.14

1.43

0.1514

Area

  Northern Taiwan

13.2 ± 47.7

-

-

-

-

  Central Taiwan

17.0 ± 54.2

3.57

1.16

5.48

<0.0001

  Southern Taiwan

16.0 ± 53.4

2.25

1.20

3.92

<0.0001

  Eastern Taiwan and offshore islands

12.4 ± 44.4

-2.37

1.07

-1.92

0.0543

Hypermenorrhea

  No

13.1 ± 48.4

-

-

-

  Yes

18.8 ± 55.8

3.99

1.08

7.21

<0.0001

Iron-deficiency anemia

  No

12.3 ± 45.8

-

-

-

  Yes

26.2 ± 68.4

12.8

1.04

19.83

<0.0001

Dysmenorrhea

  No

14.8 ± 52.0

-

-

-

  Yes

14.2 ± 46.3

1.32

1.13

2.32

0.0202

Infertility

  No

15.2 ± 51.7

-

-

-

  Yes

9.5 ± 36.4

-1.88

1.08

-2.18

0.0295