Table 4.

Definitions of Breast Cancer Mode of Detection

Mode of Detection	Definition
Screen-detected	Cancer diagnosed within 12 months after a positive screen and prior to the next screening mammogram (with and without self-reported symptoms)
Interval-detected*	Cancer diagnosed within 6 months after or 30 days before a diagnostic mammogram, with a screening mammogram within 42 months prior to that mammogram
Clinical-detected	A diagnostic mammogram between 6 months prior to and 30 days after the cancer diagnosis and no prior mammogram within 3.5 years (42 months) of the diagnostic mammogram

^*Note that the definition of interval cancer varies from that used to determine screening performance.