Table 2.

Factors associated with JC virus infection among controls, Washington County, MD, 1975 to 2006

CharacteristicJC virus–positive
JC virus–negative
P
n (%)n (%)
Sex
    Male266 (70.0)114 (30.0)
    Female341 (72.2)131 (27.8)0.48
Age (y)
    <3530 (83.3)6 (16.7)
    35-4467 (72.8)25 (27.2)
    45-54173 (70.9)71 (29.1)
    55-64172 (67.5)83 (32.5)
    65-74123 (73.2)45 (26.8)
    ≥7534 (69.4)15 (30.6)0.09
Smoking status
    Current125 (74.0)44 (26.0)0.87*
    Former156 (65.5)82 (34.5)0.03*
    Never326 (73.3)119 (26.7)
Body mass index (kg/m2)
    <2591 (58.7)64 (41.3)
    25-3081 (49.4)83 (50.6)
    >3025 (41.0)36 (59.0)0.05
NSAID use at baseline (past 48 h)
    Yes174 (28.7)64 (26.1)
    No433 (74.3)181 (73.9)0.45
Family history of colorectal cancer
    No127 (51.2)121 (48.8)
    Yes22 (52.4)20 (47.6)1.00
Recent hormone use
    None83 (50.0)83 (50.0)
    Any19 (54.3)16 (45.7)0.71
  • * P values correspond to comparison between current versus never smokers and former versus never smokers.

  • Data obtained from CLUE II participants only.

  • NSAID use within 48 h prior to blood draw.