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Table 3 Average VZV level change per year subgroup analysis

From: Association between quantitative varicella-zoster virus antibody levels and zoster reactivation in HIV-infected persons

  Mean index value/OD (n) SD T-test
On ART at second serum
 No 0.03 (119) 0.21 1.58
 Yes − 0.01 (180) 0.25 1.58
Duration of HIV infection at second serum (years)
 < 7 0.04 (153) 0.27 2.45*
 7+ − 0.03 (146) 0.19 2.45*
Viral load at second serum (log10 copies/mL) 
 < 400 0.01 (127) 0.21 − 0.01
 400+ 0.01 (170) 0.25 − 0.01
CD4 at second serum (cells/μL)
 < 500 − 0.01 (149) 0.27 − 1.02
 500+ 0.02 (149) 0.19 − 1.02
CD4 at HIV diagnosis (cells/μL)
 < 500 0.00 (111) 0.25 − 0.09
 500+ 0.01 (157) 0.22 − 0.09
Age at HIV diagnosis (years)
 < 30 0.01 (174) 0.25 − 0.02
 30+ 0.01 (125) 0.21 − 0.02
Age at VZV infection (years) 
 < 40 0.01 (59) 0.17 0.12
 40+ 0.01 (40) 0.14 0.12
  1. * indicates p < 0.05