Table 3 Distribution of the variables regarding primary dysmenorrhoea as the outcome

Age, y

 < 20

363 (15.1)

324 (14.8)

39 (18.3)

1.21

0.86

1.70

 20–35

1455 (60.7)

1326 (60.7)

129 (60.6)

1.00

1.00

1.00

 > 35

579 (24.2)

534 (24.4)

45 (21.1)

0.88

0.63

1.21

Body mass index, Kg·m⁻²

 < 25

1457 (60.8)

1339 (61.3)

118 (55.4)

1.00

1.00

1.00

 25–30

731 (30.5)

663 (30.4)

68 (31.9)

1.15

0.86

1.53

 > 30

209 (8.7)

182 (8.3)

27 (12.7)

1.60

1.08

2.36

Marital status

 Married/stable union

1486 (62.0)

1358 (62.2)

128 (60.1)

1.00

1.00

1.00

 Single, widow

829 (34.6)

751 (34.4)

78 (36.6)

1.09

0.84

1.43

 Divorced

80 (3.3)

73 (3.4)

7 (3.3)

1.02

0.49

2.10

Educational level

 Low (< 8 years)

266 (11.1)

247 (11.4)

19 (8.9)

0.75

0.47

1.19

 Intermediate (8–12 years)

1515 (63.4)

1371 (63.0)

144 (67.6)

1.00

1.00

1.00

 High (> 12 years)

609 (25.5)

559 (25.7)

50 (23.5)

0.86

0.64

1.18

Occupation

 Employee

1019 (42.7)

922 (42.4)

97 (45.5)

1.00

1.00

1.00

 Housewife

301 (12.6)

275 (12.6)

26 (12.2)

0.91

0.60

1.37

 In education

985 (41.3)

899 (41.4)

86 (40.4)

0.92

0.70

1.21

 Unemployed

82 (3.4)

78 (3.6)

4 (1.9)

0.51

0.19

1.36

Remuneration

1121 (46.8)

1020 (46.8)

101 (47.4)

0.98

0.76

1.26

Physical activity

979 (40.9)

889 (40.7)

90 (42.2)

1.06

0.82

1.37

Religious practice

1698 (70.9)

1544(70.7)

154 (72.3)

1.07

0.80

1.43

Smoking

474 (19.8)

414 (19.0)

60 (28.2)

1.59

1.20

2.11

Alcohol use disorder

1358 (56.6)

1227 (56.2)

131 (61.5)

1.22

0.94

1.59

Illicit drug use

131 (5.5)

111 (5.1)

20 (9.4)

1.79

1.17

2.74

Violence victim

565 (23.6)

486 (22.2)

79 (37.1)

1.91

1.47

2.48

Abdominal surgery

668 (27.9)

592 (27.1)

76 (35.7)

1.44

1.11

1.88

Contraceptive use

620 (25.9)

567 (26.0)

53 (24.9)

0.95

0.71

1.28

Abnormal menstruation

431 (18.0)

381 (17.4)

50 (23.5)

1.40

1.04

1.89

Previous sexual intercourse

1909 (79.6)

1727 (79.1)

182 (85.4)

1.50

1.04

2.17

Parity

 0

1224 (51.1)

1114 (51.0)

110 (51.6)

1.00

1.00

1.00

 1–2

752 (31.4)

675 (30.9)

77 (36.2)

1.08

0.73

1.60

 3 + 

411 (17.2)

372 (17.2)

49 (17.0)

1.35

0.88

2.07

Dyspareunia

210 (16.2)

170 (14.6)

40 (30.8)

2.30

1.63

3.24

Cardiovascular disease

142 (5.9)

130 (6.0)

12 (5.6)

0.95

0.54

1.66

Diabetes

33 (1.4)

27 (1.2)

6 (2.8)

2.08

1.00

4.33

Respiratory disease

176 (7.3)

154 (7.0)

22 (10.3)

1.45

0.96

2.20

Cancer

17 (0.7)

17 (0.8)

0 (0.0)

–

–

–

Psychiatric disorder

77 (3.2)

66 (3.0)

11 (5.2)

1.64

0.94

2.88

Migraine/chronic headache

552 (23.0)

479 (21.9)

73 (34.3)

1.51

1.06

2.16

Lombalgia

382 (15.9)

339 (15.5)

43 (20.2)

1.13

0.70

1.82

Irritative urinary symptoms

373 (15.6)

319 (14.6)

54 (25.4)

1.84

1.38

2.46

Constipation

482 (20.1)

443 (20.3)

39 (18.3)

0.89

0.64

1.24

Distension

937 (39.1)

824 (37.7)

113 (53.0)

1.77

1.37

2.29

IBS criteria

283 (11.8)

220 (10.1)

63 (29.6)

3.14

2.40

4.10

Bristol scale

 Types 1–2

675 (28.2)

612 (28.0)

63 (29.6)

1.05

0.80

1.40

 Types 3–4–5

1650 (68.9)

1503 (68.9)

146 (68.5)

1.00

1.00

1.00

 Types 6–7

71 (3.0)

67 (3.1)

4 (1.9)

0.64

0.24

1.67

Sleep disturbance

654 (27.3)

529 (24.2)

125 (58.7)

2.61

1.86

3.65

SRQ >  = 8

425 (17.7)

352 (16.1)

73 (34.3)

2.30

1.63

3.24