Table 2 Factors associated with probability of response to the postal questionnaire ( n = 4,029)

Woman’s age (years)

<0.001

0.001

 < 30

60

1

1

 30-34

65

1.23

1.04-1.46

1.31

1.10-1.57

 35-39

53

0.77

0.64-0.92

0.95

0.79-1.16

 ≥ 40

39

0.44

0.34-0.55

0.68

0.52-0.88

Inclusion center

<0.001

<0.001

 Marseille

53

1

1

 Bois-Guillaume

63

1.49

1.21-1.84

1.56

1.25-1.94

 Sèvres

54

1.03

0.83-1.27

1.18

0.92-1.51

 Besançon

64

1.55

1.20-2.00

1.53

1.17-2.02

 Caen

69

1.97

1.56-2.49

2.05

1.60-2.62

 Cochin

50

0.86

0.66-1.12

0.97

0.74-1.28

 Clermont-Ferrand

63

1.47

1.16-1.86

1.29

1.00-1.66

 Montsouris

48

0.79

0.63-0.99

0.85

0.67-1.08

Year of 1st oocyte retrieval

0.03*

0.002*

 2000

56

1

1

 2001

57

1.05

0.89-1.23

1.10

0.92-1.32

 2002

60

1.18

1.01-1.39

1.31

1.09-1.56

Origin of infertility

0.75

0.14

 Female

57

1

1

 Male

58

1.02

0.88-1.19

0.95

0.80-1.11

 Couple

57

1.01

0.84-1.21

0.93

0.76-1.13

 Unexplained

60

1.12

0.91-1.38

1.22

0.97-1.53

Number of embryos obtained at 1st attempt

<0.001*

0.40*

 0-1

55

1

1

 2-5

56

1.04

0.87-1.24

0.97

0.81-1.17

 > 5

62

1.34

1.12-1.61

1.06

0.87-1.30

Number of attempts

0.61*

0.04*

 1

57

1

1

 2-4

58

1.06

0.92-1.21

1.12

0.97-1.30

 >4

57

1.02

0.81-1.28

1.27

0.99-1.63

Result of IVF

 No live birth

48

1

1

 ≥ 1 live birth

70

2.44

2.14-2.78

<0.001

2.26

1.96-2.61

<0.001