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Table 2 Frequency of anti-Tat antibodies and disease stage

From: Association between different anti-Tat antibody isotypes and HIV disease progression: data from an African cohort

   IgG IgA IgM Negative
CD4+ T cells (cells/μl) <200 7/17 (41 %) 4/17 (24 %) 5/17 (29 %) 7/17 (41 %)
200–500 23/48 (48 %) 10/48 (21 %) 22/48 (46 %) 12/48 (25 %)
>500 14/30 (47 %) 1/30 (3 %) 22/30 (73 %) 6/30 (20 %)
  p-valuea 0.92 0.05 0.008 0.27
  1. aFrequency of the different anti-Tat antibody isotypes was calculated in every stratum and compared using Freeman-Halton extension of the Fisher’s exact probability test for a two-rows by three-columns contingency table