Table 1.

Identification of study populations for simple cyst prevalence and incidence analyses from the intervention arm of the PLCO Cancer Screening Trial

39115	women randomized to the screening arm
	4895 not eligible for TVU
	3831 not compliant with TVU
	239 with inadequate TVU(s)
30150	received at least one adequate TVU
	6610 with ovaries never visualized
	7805 at most one ovary visualized
15735	with a qualifying TVU for prevalence estimation*
	3097 with cysts/solid masses on prevalence TVU
	7137 other reasons for no TVU for incidence estimation**
5501	with a qualifying TVU for incidence estimation***

^*prevalence TVU = first screen with both ovaries visualized

^**no longer eligible, not compliant, inadequate screen, both ovaries not visualized, or prevalence TVU occurred during last screening round (year 3)

^***incidence TVU = second exam with both ovaries visualized, one year after prevalence exam, no cysts on prevalence exam