Table 2 Characteristics of the 824 participants (N, %) by household income class

Demographics and socioeconomic status

 Age group

  25–29

100

(12.1)

18

(12.9)

35

(13.2)

31

(12.4)

12

(13.5)

4

(5.1)

0.39

  30–34

294

(35.7)

41

(29.5)

108

(40.6)

88

(35.1)

28

(31.5)

29

(36.7)

  35–39

261

(31.7)

44

(31.7)

79

(29.7)

82

(32.7)

26

(29.2)

30

(38.0)

  40–44

169

(20.5)

36

(25.9)

44

(16.5)

50

(19.9)

23

(25.8)

16

(20.3)

 University education

379

(46.0)

42

(30.2)

92

(34.6)

139

(55.4)

50

(56.2)

56

(70.9)

 < 0.001

 Have a child

298

(36.2)

59

(42.4)

89

(33.5)

92

(36.7)

31

(34.8)

27

(34.2)

0.37

 Paid work status

  None

329

(39.9)

84

(60.4)

117

(44.0)

91

(36.3)

24

(27.0)

13

(16.5)

 < 0.001

   < 40 working hours per week

307

(37.3)

43

(30.9)

120

(45.1)

92

(36.7)

29

(32.6)

23

(29.1)

   ≥ 40 working hours per week

188

(22.8)

12

(8.6)

29

(10.9)

68

(27.1)

36

(40.4)

43

(54.4)

Fertility status

 Treatment stage ^b

  Receiving infertility tests with or without timed intercourse

346

(42.0)

64

(46.0)

115

(43.6)

90

(36.0)

42

(47.2)

35

(44.9)

0.43

  Ovulation induction or intrauterine insemination

215

(26.1)

33

(23.7)

79

(29.9)

65

(26.0)

21

(23.6)

17

(21.8)

  Assisted reproductive technology treatments

259

(31.4)

42

(30.2)

70

(26.5)

95

(38.0)

26

(29.2)

26

(33.3)

 Infertility diagnosis

  Female

228

(27.7)

40

(28.8)

75

(28.2)

76

(30.3)

20

(22.5)

17

(21.5)

0.37

  Male

65

(7.9)

11

(7.9)

13

(4.9)

22

(8.8)

12

(13.5)

7

(8.9)

  Male & female

100

(12.1)

13

(9.4)

38

(14.3)

35

(13.9)

6

(6.7)

8

(10.1)

  Unknown

374

(45.4)

68

(48.9)

118

(44.4)

104

(41.4)

44

(49.4)

40

(50.6)

  Under investigation

57

(6.9)

7

(5.0)

22

(8.3)

14

(5.6)

7

(7.9)

7

(8.9)