Table 1: Correlations between CD9 expression on human granulosa cells (GCs) and platelets and fertilization rates in oocytes.

Correlation with fertilization rate in all oocytes Correlation with fertilization rate in mature oocytesa
Measure of CD9 expressionCorrelation coefficientP-ValueCorrelation coefficientP-Value

Percent of GCs expressing CD9 ( )      .43      .48
Surface density of CD9b on GCs ( ) .09 .04
Surface density of CD9b on platelets ( ) .49 .89

aSee the text for the definition of mature oocytes.
bCD9 surface density was measured as the mean intensity of CD9-PE fluorescence during flow cytometry.