Table 2

Participant demographicsa

DemographicResult for:
PSV exposedPSV naïve
MCV4 (n = 145)MPSV4 (n = 142)MCV4 (n = 163)
Boys (no. [%])67 (46.3)64 (45.1)110. (67.5)
Age (yr)
    Mean17.917.817.9
    Median18.017.917.8
    Range16.0–19.916.0–19.916.0–19.9
Mean time since bivalent vaccine (mo [SD])92.6 (28.0)91.7 (26.9)NA
Mean time since MPSV4 (mo [SD])38.8 (11.9)38.1 (9.4)NA
  • a PSV exposed means participants who received meningococcal polysaccharide vaccine before study entry. PSV naïve means participants who did not receive meningococcal polysaccharide vaccine before study entry. MCV4 indicates participants who received quadrivalent meningococcal conjugate vaccine. MPSV4 indicates participants who received quadrivalent meningococcal polysaccharide vaccine. NA, not applicable.