Table 3.

Cumulative FP probabilities by screening round stratified by participation in additional screening rounds and results of a hypothesis test for association between number of screens and history of screening exam results. Unadjusted probabilities (Unadj) and hypothesis test results are presented in addition to results adjusted for baseline age, average interval between screening exams, year of first exam, and registry (Adj). N = number of women.

Screening round	Additional screens			Last screen			Unadj	Adj
	N	Unadj %	Adj %	N	Unadj %	Adj %	p	p
1	12,471	15.6	16.1	13,387	16.8	16.3	<0.01	0.51
2	10,628	22.7	22.5	8,115	24.5	24.9	<0.01	<0.01
3	7,777	28.1	27.2	5,822	30.4	31.9	<0.01	<0.01
4	5,271	33.0	31.8	4,121	35.3	37.1	<0.01	<0.01
5	3,138	36.3	34.3	2,939	40.2	42.6	<0.01	<0.01
6	1,747	39.4	36.9	1,790	42.4	45.2	0.005	<0.01
7	811	40.2	37.8	1,119	46.3	48.4	<0.01	<0.01
8	340	44.2	40.4	557	44.6	47.0	0.90	0.01
9	105	41.3	38.9	266	51.7	52.9	0.01	<0.01