TABLE 2

Number of males with various sperm indexes within each fertility class: a comparison between current and previous studies

Sperm index
1234SubtotalMeanSD
Davis and Wu (1996)
Sterile26915102851.060.25
Quasi-sterile177671542631.410.67
Subfertile325518101152.050.89
Fertile69331021503.540.78
This study
Sterile58319506071.050.25
Quasi-sterile2161501043801.480.61
Subfertile9718584444102.180.92
Fertile771282793853.500.85
  • The numbers of males with a certain sperm index are compared within each fertility class between previous (Davis and Wu 1996, Table 4) and current studies. In a Kolmogorov-Smirnov test (Sokal and Rohlf 1995, p. 438), the D values are 0.0166 for sterile (P > 0.5), 0.1046 for quasi-sterile (P > 0.05), 0.0687 for subfertile (P > 0.5), and 0.1026 for fertile (P > 0.05), suggesting the consistence of male fertility classification between these two studies.