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Table 5. Percent differences between MicroCell counts and hemacytometer counts, by technician, for both SFF study counts and QC counts^*

Difference Between MicroCell Counts and Hemacytometer Counts   Technician   SFF Study Data (%)   QC Data (%)   Standard 1   NA   38   Standard 2   NA   26   Technician 1   28   40   Technician 2   13   19   Technician 3   32   29   Technician 4   11   33   Technician 5   36   20   Mean % difference for all samples, study site   24   29      technicians only   n = 509 study subjects   n = 128 replicates from 32 ejaculates   *QC indicates quality control; SFF, Study for Future Families   The SFF study data are given in Brazil et al, 2004

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