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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