Table 2.

Atopy in 1659 Italian military cadets according to index of exposure to Toxoplasma gondii,Helicobacter pylori, and hepatitis A virus

Absent atopy (<0)*Low atopy (0 to<1.2)*High atopy (≥1.2)*
Index of exposureNo of participantsNo (%)No (%)Odds ratio (95% CI)No (%)Odds ratio (95% CI)
0796494 (62.1)142 (17.8)1160 (20.1)1
1618421 (68.1)109 (17.6)0.88 (0.66 to 1.18)88 (14.2)0.70 (0.52 to 0.94)§
2 or 3245181 (73.9)45 (18.4)0.87 (0.59 to 1.30)19 (7.8)0.37 (0.22 to 0.63)§
  • * Logarithm of ratio units=log (fluorescence units in sample/fluorescence units in reference serum).

  • † Reference group.

  • ‡ Adjusted for older and younger siblings, age, paternal education, and population density.

  • § P for linear trend=0.0001.