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Table 2 Relative risk of selected cancer incidence of female registered nurses according to cumulative years worked in oncology or a cancer center (method 1), 1996-2000 (N = 56,213)1,2,3,4

From: Cancer incidence and adverse pregnancy outcome in registered nurses potentially exposed to antineoplastic drugs

Site (ICD-9 code) Employment Duration Observed RR CI (95%) p-value5
All cancers except non-melanoma skin never 3078 1.00   0.135
  < 5 years 14 1.10 0.65-1.87  
  > 5 years 7 1.89 0.90-3.97  
  ever 21 1.28 0.83-1.79  
Breast (174) never 1274 1.00   0.379
  < 5 years 9 1.75 0.91-3.38  
  > 5 years 3 2.10 0.67-6.53  
  ever 12 1.83 1.03-3.23  
Uterus (179-182) never 302 1.00   0.068
  < 5 years 3 2.50 0.80-7.82  
  > 5 years 1 2.85 0.40-20.38  
  ever 4 2.58 0.96-6.94  
  1. 1Based on Poisson regression using a 10-year lag.
  2. 2Cancers with an incidence of less than 3 cases were excluded.
  3. 3N for ever worked in oncology or cancer center = 905.
  4. 4Adjusted for age and calendar year.
  5. 5Significance of the trend, derived from chi-square analysis.