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Table 1 Pre-screening and screening time periods of the study, and number of breast cancer cases

From: Estimate of overdiagnosis of breast cancer due to mammography after adjustment for lead time. A service screening study in Italy

Register

Study period

Start year of screening

Pre-screening cases

Screening cases

Total cases

Torino

1986–1996

1992

3,017

3,185

6,202

Parma

1991–2001

1997

1,567

1,714

3,281

Ferrara

1991–2001

1997

1,539

1,400

2,939

Modena

1989–1999

1995

2,283

2,056

4,339

Romagna

1990–2000

1996

3,029

3,405

6,434

Firenze

1986–1995

1991

2,084

2,239

4,323

Totals

  

13,519

13,999

27,518