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Table 14.1. Probability of spontaneous abortion

Table 14-1. Probability of spontaneous abortion.
  Number of Previous Abortions
Type of Study 0 1 2 3+
Retrospective studies        
Stevenson et al (1959)   16.3 19.2 26.2
Warburton and Fraser (1964) 12.3 26.2 32.2 30.2
Leridon (1976) 15.2 22.0 35.3  
Poland et al (1977)   19.0 35.0 47.0
Naylor and Warburton (1978) 11.0 20.3 29.2 37.0
Cohort studies        
Shapiro et al (1970) 10.9 18.0    
Awan (1974) 10.4 22.1 27.4  
Prospective studies        
Boue at al (1975)   13.8    
Harger et al (1983)     17.4 29.2
Fitzsimmons et al (1983)     31.3 45.7
Regan (1988) 5.6 11.5 29.4 36.4
Percentage of women aborting in relation to number of previous abortions.
Reproduced, with permission, from Regan L: Prospective study of spontaneous abortion. In: Beard RW, Sharp F (editors). Early Pregnancy Loss: Mechanisms and Treatment. Roy Coll Obstet Gynaecol, 1988.