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Table 1 Frequency distributions of demographic and cancer data on 63,982 female workers in electronics manufacturing

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

Variables No. %
First Employment   
   Before 20 June 1974 8,461 13.2
   20 June 1974–16 February 1976 6,778 10.6
   16 February 1976–21 November 1978 12,624 19.7
   After 21 November 1978 36,119 56.5
Age at first employment   
   < 20 years old 36,370 56.8
   ≥ 20 years old 27,612 43.2
Duration of Employment   
   < 1 month 13,496 21.1
   1–11 months 20,969 32.9
   1–4 years 11,504 18.0
   5–9 years 4,655 7.3
   ≥ 10 years 13,358 20.9
Accumulated Person-years for Different Durations of Employment   
   < 1 month 271,056 19.3
   1–11 months 471,828 33.6
   1–4 years 294,683 21.0
   5–9 years 158,847 11.3
   ≥ 10 years 207,410 14.8
Cancer Sites   
   Total (1979–2001) 1,572 100.0
   Lip, Oral Cavity and Pharynx 59 3.8
   Digestive Organs and Peritoneum 247 15.7
   Respiratory System 60 3.8
   Breast 385 24.5
   Genital Organs 585 37.2
   Urinary Organs 21 1.3
   Other and Unspecified Sites 167 10.6
   Lymphatic and Hematopoietic Tissue 48 3.1
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