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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