A statistical analysis of 100 recent cases of sterile couples, studied from February through December, 5945, is made. The management of the study is described. Sterility causes are classified under four groups: hormonal factor; tubal factor; cervical spermatic factor; spermatic (pure) factor. Every group has two subgroups: serious and not serious. The serious case is incurable or very difficult to treat (examples: azoospermia, bilateral absence or tubal obstruction, nonovulatory menstruation). Other doctor-referred cases (difficult): 61. Doctors' own wives: 15. Serious cases: 65 with three pregnancies (4.56 per cent). Not serious cases: 24, with ten pregnancies (41.8 per cent). Total number of cases finished: 89, with 13 pregnancies (14.5 per cent). Study discontinued: eleven. The last total rate (14.5 per cent) is erroneous because there is an absolute difference between the "serious cases", and the "not serious cases." In Mexico the "sterility specialist" has many "serious cases", and for this reason the rate of successful cases is low.
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