Table 2.

FAMA Antibody Titers at Varying Times After Vaccination With Research or Production Lots of Oka/Merck Varicella Vaccines, Excluding Titers After the Development of Modified Chickenox

Years After VaccinationMedian TiterP Value
Production lots*
 1 y (n = 43)8
 2 y (n = 45)41 vs 2 y, NS
 4 y (n = 37)162 vs 4 y, NS
Research lot
 1 y (n = 35)16
 2 y (n = 53)81 vs 2 y, P < .01
 4 y (n = 45)82 vs 4 y, P < .01
 6 y (n = 36)164 vs 6 y, P < .01
 8 y (n = 27)646 vs 8 y, P = NS
 10 y (n = 20)648 vs 10 y, P = NS
  • * Overall P = NS; 1 vs 4 y,P = NS.

  • Overall P < .0001; 1 vs 10 y,P = .02.