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Table 4 Comparison of frequency distributions between two breast cancer groups, by date of first employment

From: Increased standardized incidence ratio of breast cancer in female electronics workers

  Date of First Employment
  Before 20 June 1974 (n = 90) After 20 June 1974 (n = 196)
  Mean SD Range (years) Mean SD Range (years)
Age at Diagnosis 44.3 7.1 31–70 42.6 6.9 30–63
Age at First Employment* 19.6 6.1 14–46 22.4 6.3 14–43
Length of Employment* 7.8 7.5 0.005–25 4.8 6.5 0.008–18.5
  1. Note: * indicates p < 0.001 by Student t-test
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