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Table 4 Trend analysis on the number of occupations with high paternal exposure to carcinogenic agents after indexed child was born.

From: Father's occupational exposure to carcinogenic agents and childhood acute leukemia: a new method to assess exposure (a case-control study)

Variables Cases (N = 193) Controls (N = 193) Crude OR 95% CI
  N % N %  
No occupation with high exposure 139 72.0 164 85.0 1.0 Reference
One occupation with high exposure 43 23.8 28 14.5 1.81 [1.07,3.07]
Two or more occupations with high exposure 11 4.2 1 0.5 12.98 [1.65,101.78]
  1. OR, odds ratio; CI, confidence interval
  2. Chi square trend = 12.78 (p < 0.001)