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Table 1 Factors associated with probability of contact in the study ( n= 6,507)

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 = 6,231)
  % OR 95% CI P OR 95% CI P
Woman’s age (years)     <0.001*    <0.001*
 < 30 56 1    1   
 30-34 64 1.36 1.20-1.55   1.36 1.18-1.56  
 35-39 64 1.38 1.20-1.59   1.51 1.30-1.75  
 ≥ 40 64 1.42 1.18-1.70   1.65 1.34-2.03  
Inclusion center     <0.001    <0.001
 Marseille 63 1    1   
 Bois-Guillaume 52 0.65 0.56-0.76   0.69 0.58-0.81  
 Sèvres 61 0.94 0.79-1.11   0.99 0.82-1.20  
 Besançon 55 0.72 0.60-0.87   0.84 0.69-1.02  
 Caen 72 1.57 1.28-1.92   1.83 1.49-2.25  
 Cochin 62 0.95 0.77-1.18   1.05 0.84-1.32  
 Clermont-Ferrand 70 1.38 1.12-1.69   1.39 1.12-1.72  
 Montsouris 69 1.31 1.07-1.60   1.32 1.08-1.63  
Year of 1st oocyte retrieval     <0.001*    <0.001*
 2000 58 1    1   
 2001 61 1.20 1.06-1.36   1.16 1.01-1.33  
 2002 66 1.59 1.40-1.81   1.57 1.36-1.80  
Origin of infertility     0.22    0.82
 Female 62 1    1   
 Male 63 1.07 0.94-1.20   0.99 0.87-1.13  
 Couple 62 1.00 0.86-1.16   0.98 0.84-1.14  
 Unexplained 59 0.89 0.76-1.05   0.92 0.77-1.10  
Number of embryos obtained at 1st attempt     0.004*    <0.001*
 0-1 59 1    1   
 2-5 62 1.09 0.95-1.25   1.08 0.93-1.25  
 > 5 64 1.22 1.06-1.41   1.29 1.11-1.51  
Number of attempts     <0.001*    <0.001*
1 56 1    1   
2-4 64 1.43 1.28-1.58   1.51 1.35-1.69  
>4 76 2.59 2.08-3.23   2.98 2.37-3.76  
Result of IVF        
 No live birth 60 1    1   
 ≥ 1 live birth 65 1.27 1.15-1.41 <0.001 1.34 1.20-1.50 <0.001
  1. * P for trend.