Table A1.

Three-Phase Sampling Scheme

Phase	Action	No. of True Positives	Sensitivity Estimate	Conditional Lower Confidence Boundary	Unconditional Lower Confidence Boundary
1	S	0-26	—	—	—
	S	27	0.6750	—	0.5624
	S	28	0.7000	—	0.5884
	S	29	0.7250	—	0.6147
	S	30	0.7500	—	0.6412
	S	31	0.7750	—	0.6682
	S	32	0.8000	—	0.6955
	C	33	0.8250	—	0.7233
	C	34	0.8500	—	0.7515
	C	35	0.8750	—	0.7804
	C	36	0.9000	—	0.8100
	C	37	0.9250	—	0.8406
	C	38	0.9500	—	0.8724
	S	39	0.9750	—	0.9062
	S	40	1.0000	—	0.9441
2	S	33-60	—	—	—
	S	61	0.7625	0.6735	0.6906
	S	62	0.7750	0.6750	0.7040
	S	63	0.7875	0.7103	0.7174
	S	64	0.8000	0.7144	0.7309
	S	65	0.8125	0.7577	0.7445
	C	66	0.8250	0.7670	0.7582
	C	67	0.8375	0.7774	0.7720
	C	68	0.8500	0.7889	0.7858
	C	69	0.8625	0.8013	0.7998
	C	70	0.8750	0.8145	0.8140
	C	71	0.8875	0.8281	0.8282
	C	72	0.9000	0.8421	0.8426
	C	73	0.9125	0.8560	0.8572
	C	74	0.9250	0.8696	0.8721
	S	75	0.9375	0.8823	0.8872
	S	76	0.9500	0.8933	0.9026
	S	77	0.9625	0.9014	0.9184
	S	78	0.9750	0.9053	0.9348
3	S	66-98	—	—	—
	S	99	0.8250	0.7839	0.7723
	S	100	0.8333	0.7896	0.7814
	S	101	0.8417	0.7961	0.7905
	S	102	0.8500	0.8033	0.7996
	S	103	0.8583	0.8111	0.8088
	S	104	0.8667	0.8193	0.8180
	S	105	0.8750	0.8278	0.8273
	S	106	0.8833	0.8365	0.8366
	S	107	0.8917	0.8452	0.8460
	S	108	0.9000	0.8537	0.8554
	S	109	0.9083	0.8618	0.8649
	S	110	0.9167	0.8692	0.8745
	S	111	0.9250	0.8752	0.8842
	S	112	0.9333	0.8794	0.8940
	S	113	0.9417	0.8917	0.9039
	S	114	0.9500	0.8931	0.9139

Abbreviations: C, continue; S, stop.