TABLE 4

Adjusted and unadjusted multiple logistic regression model for the association of self-reported nickel allergy and pierced ears with incident rhinoconjunctivitis for males and females; imputed data, excluding those with rhinoconjunctivitis at baseline

Male (n=666)Female (n=912)
Incident rhinoconjunctivitis#cOR (95%CI)aOR (95%CI)Incident rhinoconjunctivitis#cOR (95%CI)aOR (95%CI)
Nickel allergy
 Never84 (13.8%) out of 6071189 (14.3%) out of 62211
 Ever8 (18.2%) out of 441.33 (0.60–2.99)1.29 (0.56–2.94)41 (15.4%) out of 2671.12 (0.75–1.67)1.14 (0.76–1.71)
Pierced ears
 No79 (14.4%) out of 547119 (11.2%) out of 8011
 Yes16 (13.09%) out of 1150.97 (0.54–1.73)1.08 (0.58–2.02)122 (14.7%) out of 8301.35 (0.65–2.77)1.43 (0.69–2.97)

cOR: crude odds ratio; aOR: adjusted odds ratio. #: obtained from nonimputed data; : adjusted for potential confounders (smoking status, parental socioeconomic status (SES), participant's SES, study centre and parental history of asthma).