Overdiagnosis and overtreatment of breast cancer: Estimates of overdiagnosis from two trials of mammographic screening for breast cancer

Table 1 Cancers diagnosed at and after the first three screens, Swedish Two-County Trial

Detection occasion	Number screened	Invasive cancers only	All cancers
First screen	68,770	384	426
First interval	68,770	123	134
Second screen	58,601	214	244
Second interval	58,601	78	82
Third screen	43,320	173	193
Third interval	43,320	89	91

ISSN: 1465-542X