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

From: Who does not participate in a follow-up postal study? a survey of infertile couples treated by in vitro fertilization

   Univariate analysis Multivariate analysis (n = 3,870)
  % OR 95% CI P OR 95% CI P
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
  1. * P for trend.